[PATCH] [SCEV] Improve Scalar Evolution's use of no {un, }signed wrap flags

[Bradley Smith]

Add context to patch. Apologies, I'd totally forgotten about doing this!

http://reviews.llvm.org/D6002

Files:
  lib/Analysis/ScalarEvolution.cpp
  test/Analysis/ScalarEvolution/nsw.ll
  test/Transforms/LoopUnroll/nsw-tripcount.ll
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