MIPS: [turbofan] Complete support for integer division/modulus in simplified lowering.

MIPS: [turbofan] Complete support for integer division/modulus in simplified lowering.

Port r24942 (c5055ce)

Original commit message:
Also add backend flags that tell whether integer division/modulus is
generally safe, i.e. does not trap on overflow or divide by zero.

TEST=unittests
BUG=
R=dusan.milosavljevic@imgtec.com

Committed: https://code.google.com/p/v8/source/detail?r=24956

[balazs.kilvady, 2014-10-28 16:34:59]

balazs.kilvady@imgtec.com changed reviewers:
+ akos.palfi@imgtec.com, bmeurer@chromium.org, danno@chromium.org,
dusan.milosavljevic@imgtec.com, gergely.kis@imgtec.com, paul.lind@imgtec.com

[dusmil.imgtec, 2014-10-28 16:49:03]

lgtm.

[balazs.kilvady, 2014-10-28 16:54:42]

Committed patchset #1 (id:1) manually as 24956 (presubmit successful).