[PATCH] Don't unroll loops in loop vectorization pass when VF is one.

[Wei Mi]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9007

Files:
  llvm/trunk/lib/Transforms/InstCombine/InstructionCombining.cpp
  llvm/trunk/test/Transforms/InstCombine/descale-zero.ll
  llvm/trunk/test/Transforms/InstCombine/gep-merge.ll
  llvm/trunk/test/Transforms/InstCombine/getelementptr.ll

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