Relanding r14916 that was rolled back in r14918

BUG=v8:2628
TBR=danno

Review URL: https://codereview.chromium.org/16355004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14927 ce2b1a6d-e550-0410-aec6-3dcde31c8c00