[PATCH] clang-format: Add support for SEH __try / __except / __finally blocks.

[Nico Weber]

Hi djasper,

This lets clang-format format

    __try {
    } __except(0) {
    }

and

    __try {
    } __finally {
    }

correctly. __try and __finally are keywords if `LangOpts.MicrosoftExt` is set, so this turns this on. This also enables a few other keywords, but it shouldn't overly perturb regular clang-format operation. __except is a context-sensitive keyword, so `AdditionalKeywords` needs to be passed around to a few more places.

http://reviews.llvm.org/D7386

Files:
  lib/Format/Format.cpp
  lib/Format/FormatToken.h
  lib/Format/TokenAnnotator.cpp
  lib/Format/UnwrappedLineFormatter.cpp
  lib/Format/UnwrappedLineFormatter.h
  lib/Format/UnwrappedLineParser.cpp
  unittests/Format/FormatTest.cpp

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