Make test helper work with non-copyable types

Make test helper work with non-copyable types

	* testsuite/util/testsuite_common_types.h
	(bitwise_assignment_operators): Use direct-initialization for C++11
	and later, to avoid CopyConstructible requirement.
	* testsuite/29_atomics/atomic/cons/assign_neg.cc: Adjust dg-error
	line numbers.
	* testsuite/29_atomics/atomic/cons/copy_neg.cc: Likewise.
	* testsuite/29_atomics/atomic_integral/cons/assign_neg.cc: Likewise.
	* testsuite/29_atomics/atomic_integral/cons/copy_neg.cc: Likewise.
	* testsuite/29_atomics/atomic_integral/operators/bitwise_neg.cc:
	Adjust expected errors and line numbers.

From-SVN: r241047