[PATCH] Strength reduce intrinsics with overflow into regular arithmetic operations if possible.

[Erik Eckstein]

I did a split of the change:
I committed the refactoring in r224006.

This updated diff is the remaining part: the strength reduction for sub/mul.


http://reviews.llvm.org/D6477

Files:
  lib/Transforms/InstCombine/InstCombine.h
  lib/Transforms/InstCombine/InstCombineAddSub.cpp
  lib/Transforms/InstCombine/InstCombineCalls.cpp
  test/Transforms/InstCombine/intrinsics.ll

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