[PATCH] Prevent hoisting fmul from THEN/ELSE to IF if there is fmsub/fmadd opportunity

[Lawrence Hu]

rebased patch


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7299

Files:
  include/llvm/Analysis/TargetTransformInfo.h
  include/llvm/Analysis/TargetTransformInfoImpl.h
  include/llvm/CodeGen/BasicTTIImpl.h
  include/llvm/Target/TargetLowering.h
  lib/Analysis/TargetTransformInfo.cpp
  lib/Target/AArch64/AArch64ISelLowering.cpp
  lib/Target/AArch64/AArch64ISelLowering.h
  lib/Transforms/Utils/SimplifyCFG.cpp
  test/Transforms/SimplifyCFG/AArch64/lit.local.cfg
  test/Transforms/SimplifyCFG/AArch64/prefer-fma.ll

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