P1008R1 - prohibit aggregates with user-declared constructors

P1008R1 - prohibit aggregates with user-declared constructors

	P1008R1 - prohibit aggregates with user-declared constructors
	* class.c (check_bases_and_members): For C++2a set
	CLASSTYPE_NON_AGGREGATE based on TYPE_HAS_USER_CONSTRUCTOR rather than
	type_has_user_provided_or_explicit_constructor.

	* g++.dg/ext/is_aggregate.C: Add tests with deleted or defaulted ctor.
	* g++.dg/cpp0x/defaulted1.C (main): Ifdef out for C++2a B b = {1};.
	* g++.dg/cpp0x/deleted2.C: Expect error for C++2a.
	* g++.dg/cpp2a/aggr1.C: New test.
	* g++.dg/cpp2a/aggr2.C: New test.

From-SVN: r263115