re PR c++/17232 ([DR 1640] classes and class template specializations treated differe...

re PR c++/17232 ([DR 1640] classes and class template specializations treated differently w.r.t. core issue #337)

	PR c++/17232
	PR c++/52748
	* typeck2.c (abstract_virtuals_error_sfinae): Don't complete
	the type if tf_decltype is set.
	* pt.c (fn_type_unification): Add decltype_p parm.
	(get_bindings): Adjust.
	* cp-tree.h: Adjust.
	* class.c (resolve_address_of_overloaded_function): Adjust.
	* call.c (add_template_candidate_real, print_z_candidate): Adjust.

From-SVN: r197214