Implement patch records to patch canonical objects.

tests/language/issue23244_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.
+
+// Regression test case for http://dartbug.com/23244
 import 'dart:async';
 import 'dart:isolate';
 
 enum Fisk {
   torsk,
 }
 
 isolate1(SendPort port) {
   port.send(Fisk.torsk);
 }
@@ skipping 39 matching lines @@
     expectTorsk(message[1]);
   });
 }
 
 expectTorsk(Fisk fisk) {
   if (fisk != Fisk.torsk) {
     throw "$fisk isn't a ${Fisk.torsk}";
   }
 }