Revamp references to member functions.

Revamp references to member functions.

	* method.c (hack_identifier): Call build_component_ref for a
	reference to a member function.
	* typeck.c (build_component_ref): Only return a single function
	if it's static.  Otherwise, return a COMPONENT_REF.
	(build_x_function_call): Handle a COMPONENT_REF.
	(build_unary_op): Handle all unknown-type things.
	* decl2.c (arg_assoc): Handle COMPONENT_REF.
	* class.c (instantiate_type): Complain if the function we get is a
	nonstatic member function.  Remove code for finding "compatible"
	functions.
	* pt.c (tsubst_copy): Handle NOP_EXPR.
	* tree.c (build_dummy_object): New fn.
	(maybe_dummy_object): New fn.
	(is_dummy_object): New fn.
	* cp-tree.h: Declare them.
	* cvt.c (cp_convert_to_pointer): Use maybe_dummy_object.
	* error.c (dump_expr, case OFFSET_REF): Use is_dummy_object.
	* init.c (build_member_call): Use maybe_dummy_object and
	is_dummy_object.
	(build_offset_ref): Use maybe_dummy_object.
	(resolve_offset_ref): Use is_dummy_object.
	* typeck.c (build_x_function_call): Call build_dummy_object.
	(unary_complex_lvalue): Call is_dummy_object.
	* typeck.c (build_component_addr): Make sure field is a field.
	* call.c (build_new_op): Delete obsolete code.
	* pt.c (tsubst, TEMPLATE*PARM*): Abort if we don't have any args.

From-SVN: r23186