[PATCH] Partial fix for bug 22589

[Sanjoy Das]

Address review.


http://reviews.llvm.org/D7715

Files:
  lib/Transforms/Utils/LoopUnrollRuntime.cpp
  test/Transforms/LoopUnroll/runtime-loop.ll
  test/Transforms/LoopUnroll/runtime-loop1.ll
  test/Transforms/LoopUnroll/tripcount-overflow.ll

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