Merged r18697 into 3.22 branch.

Fix representation requirement in HReturn.

R=verwaest@chromium.org
BUG=

Review URL: https://codereview.chromium.org/131513016

git-svn-id: https://v8.googlecode.com/svn/branches/3.22@18871 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/3.22' into 3.22