re PR libstdc++/65352 (array<T,0>::begin()/end() etc. forms a null reference and...

re PR libstdc++/65352 (array<T,0>::begin()/end() etc. forms a null reference and breaks on clang+ubsan)

	PR libstdc++/65352
	* include/profile/array (array::data): Use __array_traits::_S_ptr.
	* include/debug/array (array::data): Likewise.
	* include/std/array (__array_traits::_S_ptr): New function.
	(array::data): Use _S_ptr to avoid creating invalid reference.
	* testsuite/23_containers/array/tuple_interface/get_neg.cc: Adjust
	dg-error line numbers.
	* testsuite/23_containers/array/tuple_interface/tuple_element_neg.cc:
	likewise.

From-SVN: r223842