BUG=v8:2257

Review URL: https://chromiumcodereview.appspot.com/10824039
Patch from Haitao Feng <haitao.feng@intel.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12211 ce2b1a6d-e550-0410-aec6-3dcde31c8c00