Implement local check elimination on basic blocks.

BUG=
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/23866016

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16970 ce2b1a6d-e550-0410-aec6-3dcde31c8c00