[PATCH] Add Multilib selection machinery to Clang

[Jon Roelofs]

Hi rafael.espindola, atanasyan,

This patch improves the support for picking Multilibs from gcc installations. It also provides a better approximation for the flags -print-multi-directory and -print-multi-lib.

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

Files:
  include/clang/Driver/Multilib.h
  include/clang/Driver/ToolChain.h
  lib/Driver/ArgParse.cpp
  lib/Driver/ArgParse.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
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