[PATCH] [ARM] Implement eabi_attribute, cpu, and fpu directives.

[Logan Chien]

  * Avoid string parsing in emitFPU().

  * If there are multiple .fpu directive, then the later should overwrite
    the former one.

Hi richard.barton.arm, rengolin,

http://llvm-reviews.chandlerc.com/D1987

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1987?vs=5060&id=5081#toc

Files:
  include/llvm/MC/MCStreamer.h
  lib/Target/ARM/ARMAsmPrinter.cpp
  lib/Target/ARM/ARMBuildAttrs.h
  lib/Target/ARM/ARMFPUName.def
  lib/Target/ARM/ARMFPUName.h
  lib/Target/ARM/AsmParser/ARMAsmParser.cpp
  lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
  test/CodeGen/ARM/2010-09-29-mc-asm-header-test.ll
  test/CodeGen/ARM/2010-10-19-mc-elf-objheader.ll
  test/MC/ARM/directive-cpu.s
  test/MC/ARM/directive-eabi_attribute.s
  test/MC/ARM/directive-fpu-multiple.s
  test/MC/ARM/directive-fpu.s
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