[PATCH] [CodeGenPrepare] Removed duplicated logic. SimplifyCFG now knows how to speculate calls to cttz/ctlz.

[Phabricator]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7608

Files:
  llvm/trunk/lib/CodeGen/CodeGenPrepare.cpp
  llvm/trunk/test/CodeGen/PowerPC/cttz-ctlz-spec.ll
  llvm/trunk/test/CodeGen/R600/cttz-ctlz.ll
  llvm/trunk/test/CodeGen/X86/cttz-ctlz.ll
  llvm/trunk/test/Transforms/SimplifyCFG/PowerPC/cttz-ctlz-spec.ll
  llvm/trunk/test/Transforms/SimplifyCFG/PowerPC/lit.local.cfg
  llvm/trunk/test/Transforms/SimplifyCFG/R600/cttz-ctlz.ll
  llvm/trunk/test/Transforms/SimplifyCFG/R600/lit.local.cfg

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