libstdc++: Add _GLIBCXX_DEBUG checks on unordered container local_iterator

libstdc++: Add _GLIBCXX_DEBUG checks on unordered container local_iterator

Complete tests on  _GLIBCXX_DEBUG checks in include/debug/safe_local_iterator.h.

Fix several tests not testing the container corresponding to their location in the
testsuite directory.

libstdc++-v3/ChangeLog:

	* testsuite/util/debug/unordered_checks.h (fill_container): New helper method.
	(use_erased_local_iterator, invalid_local_iterator_pre_increment)
	(invalid_local_iterator_post_increment, invalid_local_iterator_compare)
	(invalid_local_iterator_range): Use latter.
	(fill_and_get_local_iterator): New, use fill_container.
	(use_invalid_local_iterator): Use latter.
	(invalid_local_iterator_arrow_operator): New test function.
	(invalid_local_iterator_copy_instantiation): New test function.
	(invalid_local_iterator_move_instantiation): New test function.
	(invalid_local_iterator_copy_assignment): New test function.
	(invalid_local_iterator_move_assignment): New test function.
	(invalid_local_iterator_const_conversion): New test function.
	* testsuite/23_containers/unordered_map/debug/invalid_local_iterator_arrow_operator_neg.cc:
	New test case.
	* testsuite/23_containers/unordered_map/debug/invalid_local_iterator_const_conversion_neg.cc:
	New test case.
	* testsuite/23_containers/unordered_map/debug/invalid_local_iterator_copy_assignment_neg.cc:
	New test case.
	* testsuite/23_containers/unordered_map/debug/invalid_local_iterator_copy_construction_neg.cc:
	New test case.
	* testsuite/23_containers/unordered_map/debug/invalid_local_iterator_move_assignment_neg.cc:
	New test case.
	* testsuite/23_containers/unordered_map/debug/invalid_local_iterator_move_construction_neg.cc:
	New test case.
	* testsuite/23_containers/unordered_map/debug/max_load_factor_neg.cc: Test unordered_map.
	* testsuite/23_containers/unordered_multimap/debug/begin2_neg.cc: Test unordered_multimap.
	* testsuite/23_containers/unordered_multimap/debug/bucket_size_neg.cc: Likewise.
	* testsuite/23_containers/unordered_multimap/debug/cbegin_neg.cc: Likewise.
	* testsuite/23_containers/unordered_multimap/debug/cend_neg.cc: Likewise.
	* testsuite/23_containers/unordered_multimap/debug/end1_neg.cc: Likewise.
	* testsuite/23_containers/unordered_multimap/debug/end2_neg.cc: Likewise.
	* testsuite/23_containers/unordered_multimap/debug/invalid_local_iterator_arrow_operator_neg.cc:
	New test case.
	* testsuite/23_containers/unordered_multimap/debug/invalid_local_iterator_const_conversion_neg.cc:
	New test case.
	* testsuite/23_containers/unordered_multimap/debug/invalid_local_iterator_copy_assignment_neg.cc:
	New test case.
	* testsuite/23_containers/unordered_multimap/debug/invalid_local_iterator_copy_construction_neg.cc:
	New test case.
	* testsuite/23_containers/unordered_multimap/debug/invalid_local_iterator_move_assignment_neg.cc:
	New test case.
	* testsuite/23_containers/unordered_multimap/debug/invalid_local_iterator_move_construction_neg.cc:
	New test case.
	* testsuite/23_containers/unordered_multimap/debug/max_load_factor_neg.cc:
	Test unordered_multimap.
	* testsuite/23_containers/unordered_multiset/debug/invalid_local_iterator_arrow_operator_neg.cc:
	New test case.
	* testsuite/23_containers/unordered_multiset/debug/invalid_local_iterator_const_conversion_neg.cc:
	New test case.
	* testsuite/23_containers/unordered_multiset/debug/invalid_local_iterator_copy_assignment_neg.cc:
	New test case.
	* testsuite/23_containers/unordered_multiset/debug/invalid_local_iterator_copy_construction_neg.cc:
	New test case.
	* testsuite/23_containers/unordered_multiset/debug/invalid_local_iterator_move_assignment_neg.cc:
	New test case.
	* testsuite/23_containers/unordered_multiset/debug/invalid_local_iterator_move_construction_neg.cc:
	New test case.
	* testsuite/23_containers/unordered_set/debug/invalid_local_iterator_arrow_operator_neg.cc:
	New test case.
	* testsuite/23_containers/unordered_set/debug/invalid_local_iterator_const_conversion_neg.cc:
	New test case.
	* testsuite/23_containers/unordered_set/debug/invalid_local_iterator_copy_assignment_neg.cc:
	New test case.
	* testsuite/23_containers/unordered_set/debug/invalid_local_iterator_copy_construction_neg.cc:
	New test case.
	* testsuite/23_containers/unordered_set/debug/invalid_local_iterator_move_assignment_neg.cc:
	New test case.
	* testsuite/23_containers/unordered_set/debug/invalid_local_iterator_move_construction_neg.cc:
	New test case.

Reviewed-by: Jonathan Wakely <jwakely@redhat.com>