[PATCH] VirtRegMap: Add undef flag when reading undefined subregisters.

[Matthias Braun]

Hi qcolombet,

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10470

Files:
  include/llvm/Target/TargetRegisterInfo.h
  lib/CodeGen/RegisterCoalescer.cpp
  lib/CodeGen/VirtRegMap.cpp

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