[PATCH] Driver: bifurcate extended and basic MSC versioning

[Saleem Abdulrasool]

Hi rnk, aaron.ballman,

This restores the original behaviour of `-fmsc-version`.  The older option
remains as a mechanism for specifying the basic version information.  A
secondary option, `-fmsc-version-ex` permits the user to specify an extended
version to the driver.

The new version takes the value as a dot-separated value rather than the
major * 100 + minor format that `-fmsc-version` format.  This makes it easier to
specify the value as well as a more flexible manner for specifying the value.

Specifying both values is considered an error (TODO: add test case).  The driver
gives preference to the extended format, defaulting to that format unless the
old option is specified.

http://reviews.llvm.org/D4353

Files:
  include/clang/Basic/LangOptions.def
  include/clang/Driver/Options.td
  lib/Basic/Targets.cpp
  lib/Driver/Tools.cpp
  lib/Frontend/CompilerInvocation.cpp
  lib/Frontend/TextDiagnostic.cpp
  test/Driver/msc-version.c
  test/Misc/diag-format.c
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