[PATCH] [ARM] Add Virtualization subtarget feature and add more build attributes in this area.

[Bradley Smith]

This change adds a Virtualization ARM subtarget feature along with adding proper build attribute emission for Tag_Virtualization_use (encodes Virtualization and TrustZone) and Tag_MPextension_use.

http://llvm-reviews.chandlerc.com/D2078

Files:
  lib/Target/ARM/ARM.td
  lib/Target/ARM/ARMAsmPrinter.cpp
  lib/Target/ARM/ARMBuildAttrs.h
  lib/Target/ARM/ARMSubtarget.cpp
  lib/Target/ARM/ARMSubtarget.h
  test/CodeGen/ARM/2010-09-29-mc-asm-header-test.ll
  test/CodeGen/ARM/2010-10-19-mc-elf-objheader.ll
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