[PATCH] D12695: [Driver] Use UniversalCRT on Windows if available

[Igor Kudrin via cfe-commits]

ikudrin created this revision.
ikudrin added a subscriber: cfe-commits.

With Visual Studio 2015 release, a part of runtime library was extracted and now comes with Windows Kits. This patch enables clang to use Universal CRT library if  %INCLUDE or %LIB environment varaibles are not specified.

See also https://llvm.org/bugs/show_bug.cgi?id=24741

http://reviews.llvm.org/D12695

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

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