Revert "Eliminatable CheckMaps replaced with if(true) or if(false)."

This reverts r18592 for breaking the GC stress bots.

R=machenbach@chromium.org

Review URL: https://codereview.chromium.org/137783011

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18611 ce2b1a6d-e550-0410-aec6-3dcde31c8c00