Reviewers: jarin,

Message:
PTAL

Description:
[turbofan] Implement the correct semantics for integer division/modulus.

Also fix the sdiv/udiv instructions on ARM as a nice side effect.

TEST=cctest,unittests

Please review this at https://codereview.chromium.org/677483005/

Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge

Affected files (+268, -58 lines):
  M src/arm/simulator-arm.cc
  M src/base/bits.h
  M src/base/bits.cc
  M src/compiler/machine-operator-reducer.h
  M src/compiler/machine-operator-reducer.cc
  M test/cctest/test-assembler-arm.cc
  M test/unittests/base/bits-unittest.cc
  M test/unittests/compiler/machine-operator-reducer-unittest.cc


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