PR libstdc++/29496
	* include/debug/safe_base.h (_Safe_sequence_base::_M_get_mutex,
	_Safe_iterator_base::_M_get_mutex, _M_attach_single, _M_detach_single):
	New.
	* src/debug.cc: Define the latter.
	(_Safe_sequence_base::_M_detach_all, _M_detach_singular,
	_M_revalidate_singular, _M_swap): Use the mutex.
	(_Safe_iterator_base::_M_attach, _M_detach): Adjust, forward to the
	*_single version.
	* include/debug/safe_iterator.h (_Safe_iterator<>::_M_attach_single,
	_M_invalidate_single): New.
 	* include/debug/safe_iterator.tcc: Define.
	(_Safe_iterator<>::_M_invalidate): Adjust, forward to
	_M_invalidate_single.
	* include/debug/safe_sequence.h (_Safe_sequence<>::_M_invalidate_if,
	_M_transfer_iter): Use the mutex, adjust, forward to the *_single
	versions of _M_invalidate and _M_attach.
	* config/abi/pre/gnu.ver (_Safe_sequence_base::_M_get_mutex,
	_Safe_iterator_base::_M_get_mutex, _M_attach_single, _M_detach_single):
	Add @GLIBCXX_3.4.10; adjust.
	* configure.ac (libtool_VERSION): To 6:10:0.
	* testsuite/util/testsuite_abi.cc (check_version): Add GLIBCXX_3.4.10.
	* configure: Regenerate.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@118701 138bc75d-0d04-0410-961f-82ee72b054a4