re PR libstdc++/65839 (xmethods need updating once gdb decides how to fix 18285)

re PR libstdc++/65839 (xmethods need updating once gdb decides how to fix 18285)

	PR libstdc++/65839
	* python/libstdcxx/v6/xmethods.py (get_bool_type): New function.
	Replace all lookups of "bool" with this.
	(get_std_size_type): New function.  Replace all lookups of std::size_t
	with this.
	(*Worker): New method get_result_type.
	(DequeWorkerBase.__init__): New arg val_type.  All callers updated.
	(ListWorkerBase.__init__): New arg val_type.  All callers updated.
	(UniquePtrGetWorker.__init__): New arg elem_type.  All callers updated.
	Delete setting of name, enabled.
	(UniquePtrDerefWorker.__init__): New arg elem_type.  All callers
	updated.  Delete setting of name.
	(UniquePtrMethodsMatcher): Rewrite for consistency with all other
	libstdc++ xmethod matchers.
	* testsuite/libstdc++-xmethods/array.cc: Add whatis tests.
	* testsuite/libstdc++-xmethods/associative-containers.cc: Ditto.
	* testsuite/libstdc++-xmethods/deque.cc: Ditto.
	* testsuite/libstdc++-xmethods/forwardlist.cc: Ditto.
	* testsuite/libstdc++-xmethods/list.cc: Ditto.
	* testsuite/libstdc++-xmethods/unique_ptr.cc: Ditto.
	* testsuite/libstdc++-xmethods/vector.cc: Ditto.

From-SVN: r222599