[PATCH] Resubmit "Improve Windows toolchain support for non-standard environments."

[Zachary Turner]

Hi hans, rnk, aaron.ballman,

    This resubmits change r220226.  That change broke the chromium
    build bots because chromium it ships an hermetic MSVC toolchain
    that it expects clang to fallback to by finding it on the path.

    This patch fixes the issue by bumping up the prioritization of PATH
    when looking for MSVC binaries.

http://reviews.llvm.org/D5892

Files:
  lib/Driver/ToolChains.h
  lib/Driver/Tools.cpp
  lib/Driver/WindowsToolChain.cpp
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