libstdc++: Make debug iterator pointer sequence const [PR116369]

In revision a35dd276cbf6236e08bcf6e56e62c2be41cf6e3c the debug sequence
have been made mutable to allow attach iterators to const containers.
This change completes this fix by also declaring debug unordered container
members mutable.

Additionally the debug iterator sequence is now a pointer-to-const and so
_Safe_sequence_base _M_attach and all other methods are const qualified.
Not-const methods exported are preserved for abi backward compatibility.

libstdc++-v3/ChangeLog:

	PR c++/116369
	* config/abi/pre/gnu-versioned-namespace.ver: Use new const qualified symbols.
	* config/abi/pre/gnu.ver: Add new const qualified symbols.
	* include/debug/safe_base.h
	(_Safe_iterator_base::_M_sequence): Declare as pointer-to-const.
	(_Safe_iterator_base::_M_attach, _M_attach_single): New, take pointer-to-const
	_Safe_sequence_base.
	(_Safe_sequence_base::_M_detach_all, _M_detach_singular, _M_revalidate_singular)
	(_M_swap, _M_get_mutex): New, const qualified.
	(_Safe_sequence_base::_M_attach, _M_attach_single, _M_detach, _M_detach_single):
	const qualify.
	* include/debug/safe_container.h (_Safe_container<>::_M_cont): Add const qualifier.
	(_Safe_container<>::_M_swap_base): New.
	(_Safe_container(_Safe_container&&, const _Alloc&, std::false_type)):
	Adapt to use latter.
	(_Safe_container<>::operator=(_Safe_container&&)): Likewise.
	(_Safe_container<>::_M_swap): Likewise and take parameter as const reference.
	* include/debug/safe_unordered_base.h
	(_Safe_local_iterator_base::_M_safe_container): New.
	(_Safe_local_iterator_base::_Safe_local_iterator_base): Take
	_Safe_unordered_container_base as pointer-to-const.
	(_Safe_unordered_container_base::_M_attach, _M_attach_single): New, take
	container as _Safe_unordered_container_base pointer-to-const.
	(_Safe_unordered_container_base::_M_local_iterators, _M_const_local_iterators):
	Add mutable.
	(_Safe_unordered_container_base::_M_detach_all, _M_swap): New, const qualify.
	(_Safe_unordered_container_base::_M_attach_local, _M_attach_local_single)
	(_M_detach_local, _M_detach_local_single): Add const qualifier.
	* include/debug/safe_unordered_container.h (_Safe_unordered_container::_M_self()): New.
	* include/debug/safe_unordered_container.tcc
	(_Safe_unordered_container::_M_invalidate_if, _M_invalidated_local_if): Use latter.
	* include/debug/safe_iterator.h (_Safe_iterator<>::_M_attach, _M_attach_single):
	Take _Safe_sequence_base as pointer-to-const.
	(_Safe_iterator<>::_M_get_sequence): Add const_cast and comment about it.
	* include/debug/safe_local_iterator.h (_Safe_local_iterator<>): Replace usages
	of _M_sequence member by _M_safe_container().
	(_Safe_local_iterator<>::_M_attach, _M_attach_single): Take
	_Safe_unordered_container_base as pointer-to-const.
	(_Safe_local_iterator<>::_M_get_sequence): Rename into...
	(_Safe_local_iterator<>::_M_get_ucontainer): ...this. Add necessary const_cast and
	comment to explain it.
	(_Safe_local_iterator<>::_M_is_begin, _M_is_end): Adapt.
	* include/debug/safe_local_iterator.tcc: Adapt.
	* include/debug/safe_sequence.h
	(_Safe_sequence<>::_M_invalidate_if, _M_transfer_from_if): Add const qualifier.
	* include/debug/safe_sequence.tcc: Adapt.
	* include/debug/deque (std::__debug::deque::erase): Adapt to use new const
	qualified methods.
	* include/debug/formatter.h: Adapt.
	* include/debug/forward_list (_Safe_forward_list::_M_this): Add const
	qualification and return pointer for consistency with 'this' keyword.
	(_Safe_forward_list::_M_swap_aux): Rename into...
	(_Safe_forward_list::_S_swap_aux): ...this and take sequence as const reference.
	(forward_list<>::resize): Adapt to use const methods.
	* include/debug/list (list<>::resize): Likewise.
	* src/c++11/debug.cc: Adapt to const qualification.
	* testsuite/util/testsuite_containers.h
	(forward_members_unordered::forward_members_unordered): Add check on local_iterator
	conversion to const_local_iterator.
	(forward_members::forward_members): Add check on iterator conversion to
	const_iterator.
	* testsuite/23_containers/unordered_map/const_container.cc: New test case.
	* testsuite/23_containers/unordered_multimap/const_container.cc: New test case.
	* testsuite/23_containers/unordered_multiset/const_container.cc: New test case.
	* testsuite/23_containers/unordered_set/const_container.cc: New test case.
	* testsuite/23_containers/vector/debug/mutex_association.cc: Adapt.

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