[PATCH] Refactor ARM subarchitecture parsing.

[Gabor Ballabas]

Added 'ARMSubArch' prefix for the SubArchType enum.
Added 'v4' as default ARMArchFeature in the ParseArmTriple function.

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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