stl_list.h (list::_M_size): Use NSDMI.

	* include/bits/stl_list.h (list::_M_size): Use NSDMI.
	* testsuite/23_containers/list/requirements/dr438/assign_neg.cc:
	Adjust line numbers.
	* testsuite/23_containers/list/requirements/dr438/
	constructor_1_neg.cc: Likewise.
	* testsuite/23_containers/list/requirements/dr438/
	constructor_2_neg.cc: Likewise.
	* testsuite/23_containers/list/requirements/dr438/insert_neg.cc:
	Likewise.

From-SVN: r185580