[PATCH] [ARM] Improve build attributes emission

[Amara Emerson]

This change cleans up the ARM build attribute emitter. Some of the cpu specific code has been removed/refactored and the subtarget information is better used in deciding which attributes and values to emit.

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

Files:
  lib/Target/ARM/ARMAsmPrinter.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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