MIPS: Fix zlib critical performance regression.

The very low score on zlib benchmark is caused by
huge number of deoptimizations inside BinaryOpIC stubs
when arguments are boolean.

TEST=
BUG=
R=plind44@gmail.com

Review URL: https://codereview.chromium.org/136193011

Patch from Dusan Milosavljevic <Dusan.Milosavljevic@rt-rk.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@19006 ce2b1a6d-e550-0410-aec6-3dcde31c8c00