[PATCH] Add isRegSequence property

[Quentin Colombet]

Update according Hal's feedbacks.
- Fix a formatting issue.
- Introduce a new target hook TargetInstrInfo::getRegSequenceLikeInputs called directly by TargetInstrInfo::getRegSequenceInputs.

http://reviews.llvm.org/D4734

Files:
  include/llvm/CodeGen/MachineInstr.h
  include/llvm/MC/MCInstrDesc.h
  include/llvm/Target/TargetInstrInfo.h
  lib/CodeGen/TargetInstrInfo.cpp
  utils/TableGen/CodeGenInstruction.cpp
  utils/TableGen/CodeGenInstruction.h
  utils/TableGen/InstrInfoEmitter.cpp
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