[PATCH] clang-format: support optionality markers in JS types

[Martin Probst]

Hi djasper,

This removes a space preceding optionality markers in JS types, e.g. in "function(x?: y) {}".

Also refactors the detection logic for TT_JsTypeColon to be a bit more readable.

http://reviews.llvm.org/D8987

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

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