[PATCH] ARM IAS: improve .eabi_attribute handling

[Saleem Abdulrasool]

Hi logan, rengolin, t.p.northover,

Parse tag names as well as expressions.  The former is part of the
specification, the latter is for improved compatibility with the GNU assembler.
Fix attribute value handling to be comformant to the specification.


http://llvm-reviews.chandlerc.com/D2484

Files:
  include/llvm/MC/MCStreamer.h
  lib/Target/ARM/ARMBuildAttrs.cpp
  lib/Target/ARM/ARMBuildAttrs.h
  lib/Target/ARM/AsmParser/ARMAsmParser.cpp
  lib/Target/ARM/CMakeLists.txt
  lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
  test/CodeGen/ARM/build-attributes-encoding.s
  test/MC/ARM/directive-eabi_attribute-2.s
  test/MC/ARM/directive-eabi_attribute-diagnostics.s
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