[Isolates] Merge 6700:7030 from bleeding_edge to isolates.

test/mjsunit/regress/regress-1213.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 23 matching lines @@
 function TestGlobal() {
   for (var i = 0; i < 2; i++) {
     x = x + 1;
   }
   this.eval('function x() {};');
   delete this['x'];
 }
 
 TestGlobal();
 TestGlobal();