clang-format: [JS] recognized named functions in AnnotatingParser.

Summary: This also fixes union type formatting in function parameter types.

Before: function x(path: number| string) {}
After: function x(path: number|string) {}

Reviewers: djasper

Subscribers: klimek, cfe-commits

Differential Revision: http://reviews.llvm.org/D21206

llvm-svn: 272330