* call.c (add_function_candidate): Treat conversion functions
	as coming from the argument's class.
	* cp-tree.h (DECL_CONV_FN_P): New fn.
	(DECL_DESTRUCTOR_P): Also check DECL_LANGUAGE.
	* class.c (add_method): Use DECL_CONV_FN_P.
	* decl2.c (check_classfn): Likewise.
	* error.c (dump_function_name): Likewise.
	(dump_function_decl): Likewise.
	* pt.c (fn_type_unification): Likewise.
	* search.c (add_conversions): Likewise.

From-SVN: r23387