[PATCH] clang-cl: implement /fallback mode

[Hans Wennborg]

Hi rnk,

This is a stab at implementing a fallback mode for clang-cl.

In this mode, clang-cl falls back to cl.exe if it cannot compile the code itself for some reason.

The idea is to use this to help build projects that almost compile with clang-cl, except for some files where it can use the fallback.

http://llvm-reviews.chandlerc.com/D1711

Files:
  include/clang/Driver/CLCompatOptions.td
  include/clang/Driver/Job.h
  include/clang/Driver/Tool.h
  lib/Driver/Job.cpp
  lib/Driver/Tools.cpp
  lib/Driver/Tools.h
  test/Driver/cl-fallback.c
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