[PATCH] clang-format: [JS] support optional methods.

[Martin Probst]

Hi djasper,

Optional methods use `?` tokens like this:

    interface X { y?(): z; }

It seems easiest to detect and disambiguate these
from ternary expressions by checking if the code
is in a declaration context. Turns out that that
didn't quite work properly for interfaces in Java
and JS, and for JS file root contexts.

http://reviews.llvm.org/D9491

Files:
  lib/Format/TokenAnnotator.cpp
  lib/Format/UnwrappedLineParser.cpp
  unittests/Format/FormatTestJS.cpp

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