libstdc++: Expand tests for std::type_order.

libstdc++: Expand tests for std::type_order.

Expanded test coverage to include:
* array of unknown bounds
* function types and pointers
* data and function member pointers

libstdc++-v3/ChangeLog:

	* testsuite/18_support/comparisons/type_order/1.cc: Add tests
	for more type.

gcc/testsuite/ChangeLog:

	* g++.dg/cpp26/type-order1.C: Add tests for more type.

Reviewed-by: Jakub Jelinek <jakub@redhat.com>
Reviewed-by: Jonathan Wakely <jwakely@redhat.com>
Signed-off-by: Tomasz Kamiński <tkaminsk@redhat.com>