[PATCH] [AArch64] Add support for the .inst directive.

[Chad Rosier]

Address Tim's comments:
 -Remove unused variables.
 -Don't silently accept the .inst directive when not targeting ELF.

 Chad

http://reviews.llvm.org/D5891

Files:
  include/llvm/MC/MCStreamer.h
  lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
  lib/Target/AArch64/MCTargetDesc/AArch64ELFStreamer.cpp
  lib/Target/AArch64/MCTargetDesc/AArch64MCTargetDesc.cpp
  lib/Target/AArch64/MCTargetDesc/AArch64MCTargetDesc.h
  lib/Target/AArch64/MCTargetDesc/AArch64TargetStreamer.cpp
  test/MC/AArch64/inst-directive-diagnostic.s
  test/MC/AArch64/inst-directive.s
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