Port r8322 (7b8b4a951f).

BUG=
TEST=

Review URL: http://codereview.chromium.org/8428004
Patch from Gergely Kis <gergely@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9885 ce2b1a6d-e550-0410-aec6-3dcde31c8c00