[PATCH] clang-format: [JS] Better support for fat arrows.

[Martin Probst]

Hi klimek,

Assigns a token type (TT_JsFatArrow) to => tokens, and uses that to
more easily recognize and format fat arrow functions.
Improves function parsing to better recognize formal parameter
lists and return type declarations.
Recognizes arrow functions and parse function bodies as child blocks.

http://reviews.llvm.org/D9906

Files:
  lib/Format/Format.cpp
  lib/Format/FormatToken.h
  lib/Format/UnwrappedLineParser.cpp
  lib/Format/UnwrappedLineParser.h
  unittests/Format/FormatTestJS.cpp

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