PR c++/91889 - follow-up fix for DR 2352.

PR c++/91889 - follow-up fix for DR 2352.

	* call.c (involves_qualification_conversion_p): New function.
	(direct_reference_binding): Build a ck_qual if the conversion
	would involve a qualification conversion.
	(convert_like_real): Strip the conversion created by the ck_qual
	in direct_reference_binding.

	* g++.dg/cpp0x/ref-bind3.C: Add dg-error.
	* g++.dg/cpp0x/ref-bind4.C: New test.
	* g++.dg/cpp0x/ref-bind5.C: New test.
	* g++.dg/cpp0x/ref-bind6.C: New test.
	* g++.old-deja/g++.pt/spec35.C: Revert earlier change.

From-SVN: r276251