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

test/mjsunit/regress/regress-1146.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 28 matching lines @@
 a.foo = 0;
 delete a.foo;
 // Do multiple calls for IC transitions.
 var b = "first";
 f(b);
 f(b);
 
 assertEquals(11, f(b));
 assertEquals(22, f(0));
 assertEquals(33, f(obj));