Unbreak Win64 build (hopefully).

cpplint, our fragile overloading of CheckEqualsHelper and Win64 don't
really play together very well...

TBR=marja@chromium.org

Review URL: https://codereview.chromium.org/354143003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22056 ce2b1a6d-e550-0410-aec6-3dcde31c8c00