Merge r8007 to 2.5 branch

test/mjsunit/regress/regress-1401.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 25 matching lines @@
 
 function foo() {
   var size = bottom + 1 + 10;
   var t =  (sizes[++bottom] = size);
   return t;
 }
 
 for (i = 0; i < 5; i++) {
   assertEquals(i + 11, foo());
 }