[PATCH] [TTI] improved cost heuristic for cttz/ctlz calls.

[Phabricator]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7554

Files:
  llvm/trunk/include/llvm/CodeGen/BasicTTIImpl.h
  llvm/trunk/test/Transforms/SimplifyCFG/SpeculativeExec.ll
  llvm/trunk/test/Transforms/SimplifyCFG/X86/speculate-cttz-ctlz.ll

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