[PATCH] Select correct embedded libclang_rt on Darwin

[Tim Northover]

  Right, this should be much more sensible now.

  * Used new interface to Driver in Tools.cpp too .
  * Used canonical ARM soft-float code, so it matched up to how the source was actually compiled (what a novelty!)
  * Added a test.

http://llvm-reviews.chandlerc.com/D2380

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2380?vs=6020&id=6023#toc

Files:
  lib/Driver/ToolChains.cpp
  lib/Driver/ToolChains.h
  lib/Driver/Tools.cpp
  lib/Driver/Tools.h
  test/Driver/Inputs/resource_dir/lib/darwin_embedded/libclang_rt.hard_pic.a
  test/Driver/Inputs/resource_dir/lib/darwin_embedded/libclang_rt.hard_static.a
  test/Driver/Inputs/resource_dir/lib/darwin_embedded/libclang_rt.soft_pic.a
  test/Driver/Inputs/resource_dir/lib/darwin_embedded/libclang_rt.soft_static.a
  test/Driver/darwin-embedded.c
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