MIPS: Ensure space for lazy deoptimization before calling IC.

Port r15808 (cc16b500)

Original commit message:
If IC triggers deoptimization, then subsequent patching might get invalid
target address that was overwritten.

BUG=

Review URL: https://codereview.chromium.org/19647007

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15811 ce2b1a6d-e550-0410-aec6-3dcde31c8c00