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

[Logan Chien]

  Add test cases for cortex-a15, cortex-m4, and cortex-r5 and fix hasD16().

  This revision of patch has following change:

  * Remove the redundant armv7 and armv8 object file test case.
  * Add cortex-a15, cortex-m4, and cortex-r15 test case.
  * Fix typo in comments.
  * Change Subtarget->isFPOnlySP() to Subtarget->hasD16().
    In order not to break the test, FeatureD16 are added to cortex-m4 and
    cortex-r5.
  * Remove the default value for OverwriteExisting in setAttributeItem().

Hi richard.barton.arm, rengolin,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1987?vs=5081&id=5168#toc

Files:
  include/llvm/MC/MCStreamer.h
  lib/Target/ARM/ARM.td
  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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