Allow comparison in UINT32 mode.

Shamelessly based on parts of https://codereview.chromium.org/288853003/. :-)

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/288383002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21355 ce2b1a6d-e550-0410-aec6-3dcde31c8c00