[PATCH] Support cross linking from x86-64 to arm on ubuntu

[Rafael Ávila de Espíndola]

  rebased.

Hi chandlerc, logan,

http://llvm-reviews.chandlerc.com/D2045

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2045?vs=5214&id=5216#toc

Files:
  lib/Driver/ToolChains.cpp
  lib/Driver/ToolChains.h
  test/Driver/Inputs/fedora_18_tree/etc/redhat-release
  test/Driver/Inputs/x86-64_ubuntu_13.10/etc/debian_version
  test/Driver/Inputs/x86-64_ubuntu_13.10/lib/.keep
  test/Driver/Inputs/x86-64_ubuntu_13.10/usr/arm-linux-gnueabi/lib/crt1.o
  test/Driver/Inputs/x86-64_ubuntu_13.10/usr/arm-linux-gnueabi/lib/crti.o
  test/Driver/Inputs/x86-64_ubuntu_13.10/usr/arm-linux-gnueabi/lib/crtn.o
  test/Driver/Inputs/x86-64_ubuntu_13.10/usr/arm-linux-gnueabihf/lib/crt1.o
  test/Driver/Inputs/x86-64_ubuntu_13.10/usr/arm-linux-gnueabihf/lib/crti.o
  test/Driver/Inputs/x86-64_ubuntu_13.10/usr/arm-linux-gnueabihf/lib/crtn.o
  test/Driver/Inputs/x86-64_ubuntu_13.10/usr/lib/gcc-cross/arm-linux-gnueabi/4.7/crtbegin.o
  test/Driver/Inputs/x86-64_ubuntu_13.10/usr/lib/gcc-cross/arm-linux-gnueabi/4.7/crtend.o
  test/Driver/Inputs/x86-64_ubuntu_13.10/usr/lib/gcc-cross/arm-linux-gnueabihf/4.8/crtbegin.o
  test/Driver/Inputs/x86-64_ubuntu_13.10/usr/lib/gcc-cross/arm-linux-gnueabihf/4.8/crtend.o
  test/Driver/linux-ld.c
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