clang-format: [JS] Format embedded function literals more efficently.

Before:
  return {
    a: a,
    link:
        function() {
          f();  //
        },
    link:
        function() {
          f();  //
        }
  };

After:
  return {
    a: a,
    link: function() {
      f();  //
    },
    link: function() {
      f();  //
    }
  };

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@217238 91177308-0d34-0410-b5e6-96231b3b80d8