dart2js: add common names to mangledGlobalNames in new emitter.

tests/language/f_bounded_quantification5_test.dart

Index: tests/language/f_bounded_quantification5_test.dart
diff --git a/tests/language/f_bounded_quantification5_test.dart b/tests/language/f_bounded_quantification5_test.dart
index b45cb2dc5dc43e21516cd981d32548b4a8ff62bb..b70f0613b51b583c56312f2204fc6ddffacb9019 100644
--- a/tests/language/f_bounded_quantification5_test.dart
+++ b/tests/language/f_bounded_quantification5_test.dart
@@ -25,6 +25,9 @@ isCheckedMode() {
 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;