If we're generating bad code anyway, we might as well crash immediately and at least get a proper backtrace.

Review URL: https://chromiumcodereview.appspot.com/10697004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11941 ce2b1a6d-e550-0410-aec6-3dcde31c8c00