mod does not rely on a fixed register anymore, the arguments are passed via the stack.

BUG=
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/21495005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16108 ce2b1a6d-e550-0410-aec6-3dcde31c8c00