[PATCH] [ARM] Improve build attributes emission

[Amara Emerson]

  I've rebased the patch on Tim's latest changes to CM-0 and him adding the new v6M subtarget arch. He left out some changes such as subtarget hooks which I've added in this patch, and I've also fixed the triple parsing to properly set the right subtarget feature when it detects a thumbv6m arch string.

  Also in this change:
   - Modified v7EM check to not use a cortex-m4 special case.
   - For vfpv4, check for single precision only when emitting Tag_FP_arch.
   - Add a test case to ensure that the Tag_ABI_FP_{normal, exceptions, number_model} are only emitted when vfp is enabled.

http://llvm-reviews.chandlerc.com/D1811

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1811?vs=4661&id=4704#toc

Files:
  lib/Target/ARM/ARMAsmPrinter.cpp
  lib/Target/ARM/ARMBuildAttrs.h
  lib/Target/ARM/ARMSubtarget.cpp
  lib/Target/ARM/ARMSubtarget.h
  lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.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/xscale-attributes.ll
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