* call.c (build_user_type_conversion_1): Refine the maybe-rvalue
	check to only return if we're converting the return value to a base
	class.

	* g++.dg/cpp0x/ref-qual19.C: Adjust the expected results.
	* g++.dg/cpp0x/ref-qual20.C: New test.

From-SVN: r264452