PR libstdc++/72847
	* include/bits/stl_bvector.h (_Bvector_base::_M_deallocate): Zero
	pointers to start and end of storage.
	* testsuite/23_containers/vector/bool/72847.cc: New test.
	* include/bits/vector.tcc (vector<bool>::_M_reallocate): Only update
	_M_finish after deallocating.
	(vector<bool>::_M_fill_insert): Likewise.
	(vector<bool>::_M_insert_range): Likewise.
	(vector<bool>::_M_insert_aux): Likewise.

From-SVN: r239497