clang-format: [JS] correcly format object literal methods.

clang-format: [JS] correcly format object literal methods.

Summary:
In JavaScript, object literals can contain methods:

   var x = {
     a() { return 1; },
   };

Previously, clang-format always parsed nested {} inside a braced list as
further braced lists. Special case this logic for JavaScript to try
parsing as a braced list, but fall back to parsing as a child block.

Reviewers: djasper

Subscribers: klimek, cfe-commits

Differential Revision: https://reviews.llvm.org/D29656

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@294315 91177308-0d34-0410-b5e6-96231b3b80d8