mod so they do not share code with the other binary operations.  They
now preallocate their fixed registers (eax and edx).  There is now no
frame effect between entries to the deferred call to the stub.

Review URL: http://codereview.chromium.org/118110

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2087 ce2b1a6d-e550-0410-aec6-3dcde31c8c00