PR c++/78890
	* class.c (check_field_decls): Diagnose REFERENCE_TYPE fields in
	unions even for C++11 and later.

	* g++.dg/init/ref14.C: Expect error even in C++11 and later.
	* g++.dg/init/union1.C: Likewise.
	* g++.dg/cpp0x/union6.C: Expect errors.
	* g++.dg/cpp0x/union8.C: New test.
	* g++.dg/cpp0x/pr78890-1.C: New test.
	* g++.dg/cpp0x/pr78890-2.C: New test.

From-SVN: r244112