[PATCH] [x32] Add X32 support to driver

[Pavel Chupin]

Added tests.
Redesigned findBiarchMultilibs for 3 arch (32,x32,64) support to pass more
tests.

http://reviews.llvm.org/D4180

Files:
  lib/Basic/Targets.cpp
  lib/Driver/ToolChains.cpp
  lib/Driver/Tools.cpp
  test/Driver/Inputs/multilib_64bit_linux_tree/usr/lib/gcc/x86_64-unknown-linux/4.6.0/x32/crtbegin.o
  test/Driver/Inputs/multilib_64bit_linux_tree/usr/libx32/gcc/x86_64-unknown-gnu/4.6.0/32/crtbegin.o
  test/Driver/Inputs/multilib_64bit_linux_tree/usr/libx32/gcc/x86_64-unknown-gnu/4.6.0/crtbegin.o
  test/Driver/Inputs/multilib_64bit_linux_tree/usr/libx32/gcc/x86_64-unknown-gnu/4.6.0/x32/crtbegin.o
  test/Driver/Inputs/multilib_64bit_linux_tree/usr/x86_64-unknown-linux/libx32/.keep
  test/Driver/Inputs/ubuntu_14.04_multiarch_tree/libx32/.keep
  test/Driver/Inputs/ubuntu_14.04_multiarch_tree/usr/include/x86_64-linux-gnu/c++/4.8/x32/.keep
  test/Driver/Inputs/ubuntu_14.04_multiarch_tree/usr/lib/gcc/x86_64-linux-gnu/4.8/x32/crtbegin.o
  test/Driver/Inputs/ubuntu_14.04_multiarch_tree/usr/lib/gcc/x86_64-linux-gnu/4.8/x32/crtend.o
  test/Driver/Inputs/ubuntu_14.04_multiarch_tree/usr/lib/x86_64-linux-gnu/.keep
  test/Driver/Inputs/ubuntu_14.04_multiarch_tree/usr/libx32/crt1.o
  test/Driver/Inputs/ubuntu_14.04_multiarch_tree/usr/libx32/crti.o
  test/Driver/Inputs/ubuntu_14.04_multiarch_tree/usr/libx32/crtn.o
  test/Driver/cross-linux.c
  test/Driver/dyld-prefix.c
  test/Driver/linux-header-search.cpp
  test/Driver/linux-ld.c
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