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

test/mjsunit/compiler/regress-closures-with-eval.js

 // Copyright 2010 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 31 matching lines @@
   var a = new Array(n);
   for (var i = 0; i < n; i++) a.push('{}');
   return a;
 }
 
 var expr = '([' + makeTagInfoJSON(128).join(', ') + '])'
 
 for (var n = 0; n < 300; n++) {
   withEval(expr, function(a) { return a; });
 }