[PATCH] ARMv7A Cleanup

[Renato Golin]

  adding some tests, found a few bugs, changed a few things.

  I'm not sure how good this patch is. I mean, it passes the tests, but that's far from acceptable. Would be good if people tried it on different ARM architectures that I have no access to, ie. iOS.

Hi doug.gregor, amaury.dlv, t.p.northover,

http://llvm-reviews.chandlerc.com/D1579

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1579?vs=3980&id=4105#toc

Files:
  lib/Basic/Targets.cpp
  lib/Driver/ToolChain.cpp
  lib/Driver/ToolChains.cpp
  lib/Driver/Tools.cpp
  test/Driver/arch.c
  test/Driver/arm-cortex-cpus.c
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