Revert 2017-08-28 Nathan Sidwell <nathan@acm.org> Restore sorted_fields vector.

Revert 2017-08-28 Nathan Sidwell <nathan@acm.org> Restore sorted_fields vector.

	Revert 2017-08-28  Nathan Sidwell  <nathan@acm.org>
	Restore sorted_fields vector.
	* cp-tree.h (lang_type): Restore sorted_fields vector.
	(CLASSTYPE_SORTED_FIELDS): Restore.
	(CLASSTYPE_BINDINGS): Delete.
	* name-lookup.c (lookup_field_1): Restore binary search.
	(sorted_fields_type_new, count_fields,
	add_fields_to_record_type, add_enum_fields_to_record_type): Restore
	(set_class_bindings): Revert.
	(insert_late_enum_def_binding): Restore field_vec insertion.

From-SVN: r251592