Assign invalid name to globalized closures.

tests/lib/mirrors/globalized_closures_test.dart

+// Copyright (c) 2014, 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.
+
+// Dart2js crashed on this example. It globalized closures and created
+// top-level classes for closures (here the globalized_closure). There was a
+// name-clash with the global "main_closure" class which led to a crash.
+
+library main;
+
+import 'dart:mirrors';
+
+import 'package:expect/expect.dart';
+
+class main_closure {
+}
+
+confuse(x) {
+  if (new DateTime.now().millisecondsSinceEpoch == 42) return confuse(() => 42);
+  return x;
+}
+
+main() {
+  new main_closure();
+  var globalized_closure = confuse(() => 499);
+  globalized_closure();
+  final ms = currentMirrorSystem();
+  var lib = ms.findLibrary(#main);
+  var collectedParents = [];
+  var classes = lib.declarations.values;
+  for (var c in classes) {
+    if (c is ClassMirror && c.superclass != null) {
+      collectedParents.add(MirrorSystem.getName(c.superclass.simpleName));
+    }
+  };
+  Expect.listEquals(["Object"], collectedParents);   /// 00: ok
+}