[PATCH] [AArch64] Enhance rematerialization by adding a new API isAsCheapAsAMove in TargetInstroInfo

[Jiangning Liu]

http://reviews.llvm.org/D4361

Files:
  include/llvm/CodeGen/MachineInstr.h
  include/llvm/MC/MCInstrDesc.h
  include/llvm/Target/TargetInstrInfo.h
  lib/CodeGen/RegisterCoalescer.cpp
  lib/Target/AArch64/AArch64InstrFormats.td
  lib/Target/AArch64/AArch64InstrInfo.cpp
  lib/Target/AArch64/AArch64InstrInfo.h
  lib/Target/AArch64/AArch64Subtarget.h
  test/CodeGen/AArch64/remat.ll
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