* c-exp.y (qualified_name): Replace explicit check for valid

	* c-exp.y (qualified_name):  Replace explicit check for valid
	destructor name with call to destructor_name_p.

	* c-lang.h, c-typeprint.c (cp_type_print_method_args):  Removed,
	no longer needed.

	* c-typeprint.c (c_type_print_varspec_prefix, c_type_print_base):
	Replace remaining fprintf_unfiltered calls with their filtered variant.
	(c_type_print_base):  Do not print return type for destructors from
	template classes.
	Replace cp_type_print_method_args with cplus_demangle call to get
	consistent type output for stubbed and unstubbed methods.

	* cp-valprint.c (cp_print_class_method):  Replace
	cp_type_print_method_args with cplus_demangle call to get consistent
	type output for stubbed and unstubbed methods.

	* gdbtypes.c, gdbtypes.h (get_destructor_fn_field):  New function
	to find the destructor field indices for a type.

	* gdbtypes.h (struct type):  Clarify comments for vptr_basetype
	and arg_types fields.
	(struct fn_field):  Remove args field, no longer used.

	* symtab.c (decode_line_1), valops.c (value_struct_elt,
	check_field_in):  Use get_destructor_fn_field to find the destructor
	field indices instead of assuming that the compiler passes the member
	function fields in a specific order.

	* symtab.c (find_methods):  Pass NULL instead of SYMBOL_BLOCK_VALUE
	to lookup_symbol.
	(list_symbol):  Replace cp_type_print_method_args with cplus_demangle
	call in zapped out code and explain why this code is zapped out.