Ported r8637 (72bd791)

BUG=
TEST=

Review URL: http://codereview.chromium.org/7386003
Patch from Paul Lind <plind44@gmail.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8686 ce2b1a6d-e550-0410-aec6-3dcde31c8c00