[PATCH] Enable unrolling of multi-exit loops

[Mark Heffernan]

http://reviews.llvm.org/D5550

Files:
  include/llvm/Analysis/ScalarEvolution.h
  lib/Analysis/ScalarEvolution.cpp
  test/Analysis/ScalarEvolution/trip-count-pow2.ll
  test/Transforms/LoopUnroll/scevunroll.ll
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