re PR c++/4379 (Member pointer to member reference not allowed when declared directly, but allowed as template parameter.)

cp:
	PR c++/4379
	* typeck.c (build_x_unary_op): Don't destroy the OFFSET_REF on a
	single non-static member.
	(unary_complex_lvalue): If it cannot be a pointer to member, don't
	make it so. Check it is not pointer to reference.
testsuite:
	* g++.dg/other/ptrmem1.C: New test.
	* g++.dg/other/ptrmem2.C: New test.

From-SVN: r48465