fix(35050): Decorator emit incorrect within try block (#41951)

* fix(35050): fix decorated block-scoped class emit

* Only use internal name when targeting ES5/3

Co-authored-by: Ron Buckton <ron.buckton@microsoft.com>

tests/cases/conformance/decorators/class/decoratedBlockScopedClass1.ts

@@ -0,0 +1,16 @@
+// @target: es5
+// @experimentaldecorators: true
+// @emitDecoratorMetadata: true
+// @filename: a.ts
+
+function decorator() {
+    return (target: new (...args: any[]) => any) => {}
+}
+
+@decorator()
+class Foo {
+    public static func(): Foo {
+        return new Foo();
+    }
+}
+Foo.func();

tests/cases/conformance/decorators/class/decoratedBlockScopedClass2.ts

@@ -0,0 +1,19 @@
+// @target: es5
+// @experimentaldecorators: true
+// @emitDecoratorMetadata: true
+// @filename: a.ts
+
+function decorator() {
+    return (target: new (...args: any[]) => any) => {}
+}
+
+try {
+    @decorator()
+    class Foo {
+        public static func(): Foo {
+            return new Foo();
+        }
+    }
+    Foo.func();
+}
+catch (e) {}

tests/cases/conformance/decorators/class/decoratedBlockScopedClass3.ts

@@ -0,0 +1,27 @@
+// @target: es5
+// @experimentaldecorators: true
+// @emitDecoratorMetadata: true
+// @filename: a.ts
+
+function decorator() {
+    return (target: new (...args: any[]) => any) => {}
+}
+
+@decorator()
+class Foo {
+    public static func(): Foo {
+        return new Foo();
+    }
+}
+Foo.func();
+
+try {
+    @decorator()
+    class Foo {
+        public static func(): Foo {
+            return new Foo();
+        }
+    }
+    Foo.func();
+}
+catch (e) {}