Fix alignment of closing brace in braced initializers.

Before:
someFunction(OtherParam, BracedList{
                           // comment 1 (Forcing intersting break)
                           param1, param2,
                           // comment 2
                           param3, param4
             });
After:
someFunction(OtherParam, BracedList{
                           // comment 1 (Forcing intersting break)
                           param1, param2,
                           // comment 2
                           param3, param4
                         });

To do so, the UnwrappedLineParser now stores the information about the
kind of brace in the FormatToken.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@185914 91177308-0d34-0410-b5e6-96231b3b80d8