[PATCH] Teach IndVarSimplify to add nuw and nsw to operations that provably don't overflow.

[Sanjoy Das]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D6748

Files:
  llvm/trunk/lib/Transforms/Utils/SimplifyIndVar.cpp
  llvm/trunk/test/Transforms/BBVectorize/loop1.ll
  llvm/trunk/test/Transforms/IndVarSimplify/2011-09-10-widen-nsw.ll
  llvm/trunk/test/Transforms/IndVarSimplify/strengthen-overflow.ll

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