[PATCH] Support generating Jom-style depfiles.

[Paul Robinson]

Hi rnk, silvas,

Jom (https://wiki.qt.io/Jom) is an NMake-compatible build tool on
Windows.  Dependency files for Jom need to use double-quotes to wrap
filespecs containing special characters, instead of the backslash
escapes that GNU Make wants.

Adds the -MV option, which specifies to use double-quotes as needed
instead of backslash escapes when writing the dependency file.

http://reviews.llvm.org/D9260

Files:
  include/clang/Driver/Options.td
  include/clang/Frontend/DependencyOutputOptions.h
  lib/Driver/Tools.cpp
  lib/Frontend/CompilerInvocation.cpp
  lib/Frontend/DependencyFile.cpp
  test/Frontend/dependency-gen-escaping.c

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