[PATCH] clang-format: Support @synchronized.

[strager]

Hi djasper,

Format @synchronized properly for the Attach brace style by
recognizing @synchronized similar to 'while'. Doing this
triggers the SpaceBeforeParens rule, so introduce
SpaceBeforeObjCSynchronizedParens to permit the old style.
(SpaceBeforeObjCSynchronizedParens: false, the default,
means use the old behaviour.)

http://reviews.llvm.org/D10371

Files:
  docs/ClangFormatStyleOptions.rst
  include/clang/Format/Format.h
  lib/Format/Format.cpp
  lib/Format/FormatToken.h
  lib/Format/TokenAnnotator.cpp
  lib/Format/UnwrappedLineParser.cpp
  unittests/Format/FormatTest.cpp

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