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

[Erik Eckstein]

Hi bkramer,

Some intrinsics, like s/uadd.with.overflow and umul.with.overflow, are already strength reduced.
This change adds other arithmetic intrinsics: s/usub.with.overflow, smul.with.overflow.
It completes the work on PR20194.

Beside that, I did also a refactoring: I extracted the creation of the resulting struct in to a separate function CreateOverflowResult().

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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