[PATCH] [AArch64] Combine multiple FDIVs with the same divisor

[Hao Liu]

http://reviews.llvm.org/D6334

Files:
  include/llvm/Target/TargetLowering.h
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/Target/AArch64/AArch64ISelLowering.cpp
  lib/Target/AArch64/AArch64ISelLowering.h
  test/CodeGen/AArch64/fdiv-combine.ll
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