[PATCH] [ARM] Add knowledge of FPU subtarget features to TargetParser

[John Brawn]

Hi rengolin,

Add getFPUFeatures to TargetParser, which gets the list of subtarget features that are enabled/disabled for each FPU, and use it when handling the .fpu directive.

No functional change in this commit, though clang will start behaving differently once it starts using this.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10237

Files:
  include/llvm/MC/MCSubtargetInfo.h
  include/llvm/MC/SubtargetFeature.h
  include/llvm/Support/TargetParser.h
  lib/MC/MCSubtargetInfo.cpp
  lib/MC/SubtargetFeature.cpp
  lib/Support/TargetParser.cpp
  lib/Target/ARM/AsmParser/ARMAsmParser.cpp

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