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: https://v8.googlecode.com/svn/branches/bleeding_edge@15127 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
MIPS: Use keyed-call inline caches in delegating yield.

Port r15111 (7de1a19)

Original commit message:
Since we can't assume anything about the shape of the iterator in a
yield* (delegating yield), use an IC to do the next() and throw()
iterator method calls.

BUG=v8:2691
TEST=mjsunit/regress/regress-2691

Review URL: https://codereview.chromium.org/16923008
Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15128 ce2b1a6d-e550-0410-aec6-3dcde31c8c00