[C++11] There can be only one ref qualifier at most.

This is a minor nit on the C++ reference qualifiers. Obviously, ref quals are not a sequence. Adding multiple ref quals did error out but this patch cleans up the error from a few unexpected tokens to one root cause. Also _seq is removed from te cp_parser function name. builds and passes all

Re: [C++11] There can be only one ref qualifier at most.

OK, thanks. Jason