[PATCH] Refactor ARM subarchitecture parsing.

[Gabor Ballabas]

Added ARMSubArch_v4 to the SubArch enum and the ParseArmTriple function.

Renato, could you land it for me? I don't have commit rights.

Thanks,
Gabor

http://reviews.llvm.org/D4375

Files:
  include/llvm/ADT/Triple.h
  lib/Support/Triple.cpp
  lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp
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