Merged r14672 into trunk branch.

MIPS: Ensure that soft-deopts don't count against opt_count

R=jkummerow@chromium.org
BUG=

Review URL: https://codereview.chromium.org/15178009

git-svn-id: https://v8.googlecode.com/svn/trunk@14676 ce2b1a6d-e550-0410-aec6-3dcde31c8c00