[PATCH] [LoopUnrollRuntime] Avoid high-cost trip count computation.

[Sanjoy Das]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8994

Files:
  llvm/trunk/include/llvm/Analysis/TargetTransformInfo.h
  llvm/trunk/include/llvm/Transforms/Utils/UnrollLoop.h
  llvm/trunk/lib/Transforms/Scalar/LoopUnrollPass.cpp
  llvm/trunk/lib/Transforms/Utils/LoopUnroll.cpp
  llvm/trunk/lib/Transforms/Utils/LoopUnrollRuntime.cpp
  llvm/trunk/test/Transforms/LoopUnroll/high-cost-trip-count-computation.ll
  llvm/trunk/test/Transforms/LoopUnroll/runtime-loop.ll
  llvm/trunk/test/Transforms/LoopUnroll/runtime-loop4.ll

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