[PATCH] Introduce a -stdlib-abi command line option.

[Peter Collingbourne]

This option may be used with OSs without a "system" libc++ to select the
underlying ABI library used by libc++.  Also, teach ToolChain to search the
installation directory for libc++ libraries and headers.  Toolchains which
know better should be overriding the relevant ToolChain members.

http://llvm-reviews.chandlerc.com/D1968

Files:
  include/clang/Driver/Options.td
  include/clang/Driver/ToolChain.h
  lib/Driver/ToolChain.cpp
  lib/Driver/ToolChains.cpp
  lib/Driver/ToolChains.h
  test/Driver/Inputs/linux_libcxx_tree/usr/include/c++/v1/.keep
  test/Driver/Inputs/linux_libcxx_tree/usr/local/bin/.keep
  test/Driver/Inputs/linux_libcxx_tree/usr/local/include/c++/v1/.keep
  test/Driver/linux-libcxx.cpp
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