Copy types object when using a cached compiler.

dart/tests/compiler/dart2js/message_kind_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.
 
 import 'package:expect/expect.dart';
 import 'dart:async';
 import "package:async_helper/async_helper.dart";
 import '../../../sdk/lib/_internal/compiler/implementation/dart2jslib.dart' show
     DualKind,
     MessageKind;
@@ skipping 30 matching lines @@
     if (kind.examples != null) {
       examples.add(name);
     } else {
       print("No example in '$name'");
     }
   };
   var cachedCompiler;
   asyncTest(() => Future.forEach(examples, (String name) {
     print("Checking '$name'.");
     Stopwatch sw = new Stopwatch()..start();
-    bool useCachedCompiler = true;
-    if (name == 'MISSING_LIBRARY_NAME') {
-      // TODO(johnniwinther): Found out why we cannot use the cached compiler
-      // for this message kind.
-      cachedCompiler = null;
-    }
-    return check(kinds[name], cachedCompiler).
-        then((var compiler) {
-          cachedCompiler = compiler;
-          sw.stop();
-          print("Checked '$name' in ${sw.elapsedMilliseconds}ms.");
-        });
-    }
-  ));
+    return check(kinds[name], cachedCompiler).then((var compiler) {
+      cachedCompiler = compiler;
+      sw.stop();
+      print("Checked '$name' in ${sw.elapsedMilliseconds}ms.");
+    });
+  }));
 }