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

test/mjsunit/regress/regress-70066.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 126 matching lines @@
 
 
 // Delete on a DONT_DELETE property of the global object.
 var y = 10;
 function test10() {
   with ({}) { return delete y; }
 }
 
 assertEquals(false, test10(), "test10");
 assertEquals(10, y, "test10");