dart2js: add common names to mangledGlobalNames in new emitter.

tests/language/f_bounded_quantification5_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Test for F-Bounded Quantification.
 
 import "package:expect/expect.dart";
 
 class A<T extends B<T>> {
 }
 
 class B<T extends A<T>> {
 }
 
 isCheckedMode() {
   try {
     var i = 1;
     String s = i;
     return false;
   } catch (e) {
     return true;
   }
 }
 
 main() {
   bool got_type_error = false;
   try {
+    // Getting "int" when calling toString() on the int type is not required.
+    // However, we want to keep the original names for the most common core
+    // types so we make sure to handle these specifically in the compiler.
     Expect.equals("A<B<int>>", new A<B<int>>().runtimeType.toString());
   } on TypeError catch (error) {
     got_type_error = true;
   }
   // Type error expected in checked mode only.
   Expect.isTrue(got_type_error == isCheckedMode());
 }