Temporarily disable uint32 mode for comparisons

BUG=v8:3380
LOG=n
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/323103002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21750 ce2b1a6d-e550-0410-aec6-3dcde31c8c00