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Avoids race condition when checking for an iterator to be singular or to be comparable to another iterator. * src/c++/debug.cc (_Safe_sequence_base::_M_attach_single): Set attached iterator sequence pointer and version. (_Safe_sequence_base::_M_detach_single): Reset detached iterator. (_Safe_iterator_base::_M_attach): Remove attached iterator sequence pointer and version asignments. (_Safe_iterator_base::_M_attach_single): Likewise. (_Safe_iterator_base::_M_detach_single): Remove detached iterator reset. (_Safe_iterator_base::_M_singular): Use atomic load to access parent sequence. (_Safe_iterator_base::_M_can_compare): Likewise. (_Safe_iterator_base::_M_get_mutex): Likewise. (_Safe_local_iterator_base::_M_attach): Remove attached iterator container pointer and version assignments. (_Safe_local_iterator_base::_M_attach_single): Likewise. (_Safe_unordered_container_base::_M_attach_local_single): Set attached iterator container pointer and version. (_Safe_unordered_container_base::_M_detach_local_single): Reset detached iterator.
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