PR c++/40139

	* pt.c (tsubst_qualified_id): Retain the type if we aren't dealing
	with a dependent type.  Actually look up the destructor.
	* semantics.c (finish_id_expression): Fix logic.
	(finish_qualified_id_expr): Don't try to use 'this' if we aren't in
	a function.
	* typeck.c (build_x_unary_op): Diagnose taking the address of a
	constructor or destructor.
	* tree.c (get_first_fn): Handle OFFSET_REF.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@147638 138bc75d-0d04-0410-961f-82ee72b054a4