[PATCH] [ARM] Improve build attributes emission

[Amara Emerson]

  Fixed v6S-M issue and added more tests to cover v6, v6m, v6t2, v7EM, v7M.

  I also noticed that the Tag_DIV_use attribute was being emitted the wrong way around. I've added some more enums to make it clearer. The ABI addenda says that DIV_use value 2 should only be used when hardware divide is available in ARM mode.

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1811?vs=4605&id=4661#toc

Files:
  lib/Target/ARM/ARMAsmPrinter.cpp
  lib/Target/ARM/ARMBuildAttrs.h
  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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