libstdc++: Remove tests for self-move debug assertions

libstdc++: Remove tests for self-move debug assertions

I recently removed the debug mode checks for self-move assignment, which
means these tests now fail when _GLIBCXX_DEBUG is added to the options
or when the check-debug target is used. Remove all the tests.

libstdc++-v3/ChangeLog:

	* testsuite/21_strings/debug/iterator_self_move_assign_neg.cc: Removed.
	* testsuite/21_strings/debug/self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/deque/debug/iterator_self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/deque/debug/self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/forward_list/debug/iterator_self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/forward_list/debug/self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/list/debug/iterator_self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/list/debug/self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/map/debug/iterator_self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/map/debug/self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/multimap/debug/iterator_self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/multimap/debug/self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/multiset/debug/iterator_self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/multiset/debug/self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/set/debug/iterator_self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/set/debug/self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/unordered_map/debug/iterator_self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/unordered_map/debug/self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/unordered_multimap/debug/iterator_self_move_assign_neg.cc:
	Removed.
	* testsuite/23_containers/unordered_multimap/debug/self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/unordered_multiset/debug/iterator_self_move_assign_neg.cc:
	Removed.
	* testsuite/23_containers/unordered_multiset/debug/self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/unordered_set/debug/iterator_self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/unordered_set/debug/self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/vector/debug/iterator_self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/vector/debug/self_move_assign_neg.cc: Removed.