Merged r18697 into 3.23 branch.

Fix representation requirement in HReturn.

R=verwaest@chromium.org
BUG=

Review URL: https://codereview.chromium.org/148213008

git-svn-id: https://v8.googlecode.com/svn/branches/3.23@18873 ce2b1a6d-e550-0410-aec6-3dcde31c8c00