MIPS: Increase sanity of integer division handling.

MIPS: Increase sanity of integer division handling.

Port r15057 (c82c777)

Original commit message:
- In the INT32 BinaryOpStub, fix type feedback collection for DIV,
bringing it in line with other platforms.
- In Lithium codegen, emit proper inlined code, don't call the stub.
- Drive-by fix: assert appropriate CpuFeaturesScope for SDIV.

BUG=

Review URL: https://codereview.chromium.org/16857004
Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15127 ce2b1a6d-e550-0410-aec6-3dcde31c8c00