[PATCH] Do not track subregister liveness when it brings no benefits

[Phabricator]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8429

Files:
  llvm/trunk/include/llvm/CodeGen/MachineRegisterInfo.h
  llvm/trunk/include/llvm/Target/TargetRegisterInfo.h
  llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp
  llvm/trunk/lib/CodeGen/LiveRangeCalc.cpp
  llvm/trunk/lib/CodeGen/LiveRangeCalc.h
  llvm/trunk/lib/CodeGen/MachineVerifier.cpp
  llvm/trunk/lib/CodeGen/RegisterCoalescer.cpp
  llvm/trunk/lib/CodeGen/VirtRegMap.cpp
  llvm/trunk/utils/TableGen/CodeGenRegisters.cpp
  llvm/trunk/utils/TableGen/CodeGenRegisters.h
  llvm/trunk/utils/TableGen/RegisterInfoEmitter.cpp

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