[PATCH] [InstCombine] mark ADD with nuw if no unsigned overflow

[Jingyue Wu]

Fixed some comments. Thanks Chandler and Mark!

http://reviews.llvm.org/D4144

Files:
  lib/Transforms/InstCombine/InstCombine.h
  lib/Transforms/InstCombine/InstCombineAddSub.cpp
  test/Transforms/InstCombine/AddOverFlow.ll
  test/Transforms/InstCombine/add-sitofp.ll
  test/Transforms/InstCombine/ffs-1.ll
  test/Transforms/InstCombine/select.ll
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