Allowed comment directives to be multiline (#38228)

* Allowed comment directives to be multiline

* Added tests, and perhaps fixed a test runner bug?

* I think it's going to need a consistent variable to loop over

* Used dynamically computed indexes in verifies

* Added multiline tests

* Increased flexibility for multiline comment parsing

* Undid a couple of formatting changes; removed backslashes from multiline regexp

* Added baseline tests for multiline comment skipping

Co-authored-by: Orta Therox <orta.therox@gmail.com>

src/compiler/utilities.ts

@@ -474,7 +474,7 @@ namespace ts {
     export function createCommentDirectivesMap(sourceFile: SourceFile, commentDirectives: CommentDirective[]): CommentDirectivesMap {
         const directivesByLine = createMapFromEntries(
             commentDirectives.map(commentDirective => ([
-                `${getLineAndCharacterOfPosition(sourceFile, commentDirective.range.pos).line}`,
+                `${getLineAndCharacterOfPosition(sourceFile, commentDirective.range.end).line}`,
                 commentDirective,
             ]))
         );