Fix SSE2 scope being too broad in DoCmpIDAndBranch.

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/12321141

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@13740 ce2b1a6d-e550-0410-aec6-3dcde31c8c00