Added Object._cid getter, optimized it. Added to (some) classes a static final _clCid. Use those to…

runtime/lib/object_patch.dart

 // Copyright (c) 2012, 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.
 
 patch class Object {
 
   // Helpers used to implement hashCode. If a hashCode is used we remember it
   // using an Expando object. A new hashCode value is calculated using a Random
   // number generator.
   static Expando _hashCodeExp = new Expando("Object.hashCode");
@@ skipping 44 matching lines @@
   // feedback. Returns receiver.
   _as(instantiator, instantiator_type_arguments, type) native "Object_as";
 
   static _symbolMapToStringMap(Map<Symbol, dynamic> map) {
     var result = new Map<String, dynamic>();
     map.forEach((Symbol key, value) {
       result[_collection_dev.Symbol.getName(key)] = value;
     });
     return result;
   }
+
+  int get _cid native "Object_cid";
 }