[PATCH] [SCEV] make SCEV smarter about proving no-wrap.

[Sanjoy Das]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7980

Files:
  llvm/trunk/include/llvm/Analysis/ScalarEvolution.h
  llvm/trunk/lib/Analysis/ScalarEvolution.cpp
  llvm/trunk/test/Analysis/ScalarEvolution/nowrap-preinc-limits.ll

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