Make 'getIndentString' just use a loop. (#41221)

* Make 'getIndentString' just use a loop.

* Added test.

* Accepted baselines.

src/compiler/utilities.ts

@@ -3849,8 +3849,10 @@ namespace ts {
 
     const indentStrings: string[] = ["", "    "];
     export function getIndentString(level: number) {
-        if (indentStrings[level] === undefined) {
-            indentStrings[level] = getIndentString(level - 1) + indentStrings[1];
+        // prepopulate cache
+        const singleLevel = indentStrings[1];
+        for (let current = indentStrings.length; current <= level; current++) {
+            indentStrings.push(indentStrings[current - 1] + singleLevel);
         }
         return indentStrings[level];
     }

tests/baselines/reference/commentWithUnreasonableIndentationLevel01.js

@@ -0,0 +1,22 @@
+//// [commentWithUnreasonableIndentationLevel01.ts]
+// Repro from #41223
+
+/**
+                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
Line truncated
+ */
+export class SomeAutoGeneratedThing {}
+
+//// [commentWithUnreasonableIndentationLevel01.js]
+"use strict";
+// Repro from #41223
+exports.__esModule = true;
+exports.SomeAutoGeneratedThing = void 0;
+/**
+                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
Line truncated
+ */
+var SomeAutoGeneratedThing = /** @class */ (function () {
+    function SomeAutoGeneratedThing() {
+    }
+    return SomeAutoGeneratedThing;
+}());
+exports.SomeAutoGeneratedThing = SomeAutoGeneratedThing;

tests/baselines/reference/commentWithUnreasonableIndentationLevel01.symbols

@@ -0,0 +1,9 @@
+=== tests/cases/compiler/commentWithUnreasonableIndentationLevel01.ts ===
+// Repro from #41223
+
+/**
+                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       Line truncated
+ */
+export class SomeAutoGeneratedThing {}
+>SomeAutoGeneratedThing : Symbol(SomeAutoGeneratedThing, Decl(commentWithUnreasonableIndentationLevel01.ts, 0, 0))
+

tests/baselines/reference/commentWithUnreasonableIndentationLevel01.types

@@ -0,0 +1,9 @@
+=== tests/cases/compiler/commentWithUnreasonableIndentationLevel01.ts ===
+// Repro from #41223
+
+/**
+                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       Line truncated
+ */
+export class SomeAutoGeneratedThing {}
+>SomeAutoGeneratedThing : SomeAutoGeneratedThing
+

tests/cases/compiler/commentWithUnreasonableIndentationLevel01.ts

@@ -0,0 +1,7 @@
+
+// Repro from #41223
+
+/**
+                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
Line truncated
+ */
+export class SomeAutoGeneratedThing {}