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

[Logan Chien]

This commit adds the eabi_attribute, cpu, and fpu directives
support to the ARM assembly parser.  Besides, this commit
also moves switchVendor(), emitAttribute(),
emitTextAttribute(), emitFPU() to ARMTargetStreamer.

It has been verified that the output binaries of the changed
test case remain unchanged.

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

Files:
  include/llvm/MC/MCStreamer.h
  lib/Target/ARM/ARMAsmPrinter.cpp
  lib/Target/ARM/ARMBuildAttrs.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.s
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