[PATCH] [arm] Implement ARM .arch directive.

[Logan Chien]

Hi richard.barton.arm, rengolin,

This patch adds the .arch directive support to ARMAsmParser.
In short, the .arch directive will define several default
values for build attributes.

http://llvm-reviews.chandlerc.com/D2133

Files:
  include/llvm/MC/MCStreamer.h
  lib/Target/ARM/AsmParser/ARMAsmParser.cpp
  lib/Target/ARM/MCTargetDesc/ARMArchName.def
  lib/Target/ARM/MCTargetDesc/ARMArchName.h
  lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
  test/MC/ARM/directive-arch-armv2.s
  test/MC/ARM/directive-arch-armv2a.s
  test/MC/ARM/directive-arch-armv3.s
  test/MC/ARM/directive-arch-armv3m.s
  test/MC/ARM/directive-arch-armv4.s
  test/MC/ARM/directive-arch-armv4t.s
  test/MC/ARM/directive-arch-armv5.s
  test/MC/ARM/directive-arch-armv5t.s
  test/MC/ARM/directive-arch-armv5te.s
  test/MC/ARM/directive-arch-armv6-m.s
  test/MC/ARM/directive-arch-armv6.s
  test/MC/ARM/directive-arch-armv6j.s
  test/MC/ARM/directive-arch-armv6t2.s
  test/MC/ARM/directive-arch-armv6z.s
  test/MC/ARM/directive-arch-armv6zk.s
  test/MC/ARM/directive-arch-armv7-a.s
  test/MC/ARM/directive-arch-armv7-m.s
  test/MC/ARM/directive-arch-armv7-r.s
  test/MC/ARM/directive-arch-armv7.s
  test/MC/ARM/directive-arch-armv8-a.s
  test/MC/ARM/directive-arch-iwmmxt.s
  test/MC/ARM/directive-arch-iwmmxt2.s
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