This way the deoptimization reasons are actually threaded through to
the jump table. Tiny cleanup of related MIPS/MIPS64 code on the way.

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/585423002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24111 ce2b1a6d-e550-0410-aec6-3dcde31c8c00