Merge 6168:6800 from bleeding_edge to experimental/gc branch.

test/mjsunit/regress/regress-1083.js

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 18 matching lines @@
 // on the global object doesn't break invariants.
 Object.defineProperty(this, 'Object', {enumerable:true});
 
 var desc = Object.getOwnPropertyDescriptor(this, 'Object');
 assertTrue(desc.enumerable);
 assertTrue(desc.configurable);
 assertFalse(desc.hasOwnProperty('get'));
 assertFalse(desc.hasOwnProperty('set'));
 assertTrue(desc.hasOwnProperty('value'));
 assertTrue(desc.writable);