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

test/mjsunit/regress/regress-1210.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 @@
   // immediately after the call to 'side_effect' (i.e., still in the key
   // subexpression of the arguments access).
   return observe(a, arguments[side_effect(a), a + 0]);
 }
 
 // Run enough to optimize assuming global 'a' is a smi.
 for (var i = 0; i < 1000000; ++i) test(0);
 
 a = "hello";
 test(0);