Revert r18131 and r18139 "Clean up in the CallStubCompiler".

and "Fix register usage."

TBR=verwaest@chromium.org

Review URL: https://codereview.chromium.org/96573002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18146 ce2b1a6d-e550-0410-aec6-3dcde31c8c00