Don't defer the stack check failure code.  It is a CallStub, which will be a single 5 byte call instruction.  This should cause equivalent code size now, but opens up the opportunity to make one of the most common jcc's to use short encoding in the future.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@369 ce2b1a6d-e550-0410-aec6-3dcde31c8c00