MIPS: Fix deoptimization for out-of-line constant pool.

Port r19940 (db96c25)

Original commit message:
Ensure that the stack contains the correct constant pool pointer when a
function deopts.

This CL depends on https://codereview.chromium.org/183803022/ landing first.

BUG=
R=plind44@gmail.com

Review URL: https://codereview.chromium.org/200253006

Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@19948 ce2b1a6d-e550-0410-aec6-3dcde31c8c00