[PATCH] Refactor duplicate functions

[Bernard Ogden]

  Break up the factored-out function to preserve a behaviour used
  in one instance but not the other. Add a unit test for this
  behaviour.

Hi rengolin, t.p.northover,

http://llvm-reviews.chandlerc.com/D2243

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2243?vs=5710&id=5731#toc

Files:
  lib/Driver/ToolChain.cpp
  lib/Driver/Tools.cpp
  lib/Driver/Tools.h
  test/Driver/arm-arch-darwin.c
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