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

test/mjsunit/regress/regress-1160.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 26 matching lines @@
   var array = Array(N);
   for (var i = 0; i < N; ++i) {
     array[i] = i;
   }
   Array.prototype.__defineSetter__(32, function() { });
   // The next line throws. We should make it work even with changed
   // prototype. See http://code.google.com/p/v8/issues/detail?id=1161
   array.join(",");
   assertUnreachable();
 } catch (e) { }