[PATCH] Generalize getExtendAddRecStart to work with both sign and zero extensions.

[Sanjoy Das]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7645

Files:
  llvm/trunk/lib/Analysis/ScalarEvolution.cpp
  llvm/trunk/test/Analysis/ScalarEvolution/infer-prestart-no-wrap.ll

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