Patches to support Dart VM patch files in dart2js.

sdk/lib/core/object.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.
 
 part of dart.core;
 
 /**
  * The base class for all Dart objects.
  *
  * Because Object is the root of the Dart class hierarchy,
@@ skipping 38 matching lines @@
    *  * Transitive: For all objects `o1`, `o2`, and `o3`, if `o1 == o2` and
    *    `o2 == o3` are true, then `o1 == o3` must be true.
    *
    * The method should also be consistent over time, so equality of two objects
    * should not change over time, or at least only change if one of the objects
    * was modified.
    *
    * If a subclass overrides the equality operator it should override
    * the [hashCode] method as well to maintain consistency.
    */
-  bool operator ==(other) => identical(this, other);
+  external bool operator ==(other);
 
   /**
    * Get a hash code for this object.
    *
    * All objects have hash codes. Hash codes are guaranteed to be the
    * same for objects that are equal when compared using the equality
    * operator [:==:]. Other than that there are no guarantees about
    * the hash codes. They will not be consistent between runs and
    * there are no distribution guarantees.
    *
@@ skipping 16 matching lines @@
    *
    * The default behavior is to throw a [NoSuchMethodError].
    */
   external dynamic noSuchMethod(Invocation invocation);
 
   /**
    * A representation of the runtime type of the object.
    */
   external Type get runtimeType;
 }