[PATCH] Fix PR22179

[Sanjoy Das]

Hi atrick, majnemer, rsmith, hfinkel,

We were incorrectly inferring nsw for certain SCEVs.  We can be more aggressive here (see Richard Smith's comment on http://llvm.org/bugs/show_bug.cgi?id=22179) but this change just focuses on correctness.

http://reviews.llvm.org/D6914

Files:
  lib/Analysis/ScalarEvolution.cpp
  test/Analysis/ScalarEvolution/pr22179.ll
  test/CodeGen/X86/avoid_complex_am.ll

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