[PATCH] Add Multilib selection machinery to Clang

[Jon Roelofs]

  Fixed issues from most recent round of review.

Hi atanasyan, rafael.espindola, chandlerc,

http://llvm-reviews.chandlerc.com/D2538

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2538?vs=6564&id=6838#toc

Files:
  include/clang/Driver/Multilib.h
  include/clang/Driver/ToolChain.h
  lib/Driver/CMakeLists.txt
  lib/Driver/Driver.cpp
  lib/Driver/Multilib.cpp
  lib/Driver/ToolChains.cpp
  lib/Driver/ToolChains.h
  lib/Driver/Tools.cpp
  lib/Driver/Tools.h
  unittests/CMakeLists.txt
  unittests/Driver/CMakeLists.txt
  unittests/Driver/Makefile
  unittests/Driver/MultilibTest.cpp
  unittests/Makefile
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