[PATCH] [Driver] Do not lose already detected set of toolchain's multilibs while iterating over different library path suffixes and different library versions.

[Simon Atanasyan]

Modify the `findMIPSMultilibs()` function so it really modifies result set of multilibs only in case of successful searching.

http://reviews.llvm.org/D3684

Files:
  lib/Driver/ToolChains.cpp
  lib/Driver/ToolChains.h
  test/Driver/Inputs/ubuntu_14.04_multiarch_tree/lib/x86_64-linux-gnu/.keep
  test/Driver/Inputs/ubuntu_14.04_multiarch_tree/usr/include/c++/4.8/backward/.keep
  test/Driver/Inputs/ubuntu_14.04_multiarch_tree/usr/include/x86_64-linux-gnu/c++/4.8/32/.keep
  test/Driver/Inputs/ubuntu_14.04_multiarch_tree/usr/lib/gcc/x86_64-linux-gnu/4.8/32/crtbegin.o
  test/Driver/Inputs/ubuntu_14.04_multiarch_tree/usr/lib/gcc/x86_64-linux-gnu/4.8/crtbegin.o
  test/Driver/Inputs/ubuntu_14.04_multiarch_tree/usr/lib/gcc/x86_64-linux-gnu/4.9/.keep
  test/Driver/linux-header-search.cpp
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