* class.c (subobject_offset_fn): New type.
	(dfs_record_base_offsets): Remove.
	(record_base_offsets): Likewise.
	(dfs_search_base_offsets): Likewise.
	(record_subobject_offset): New function.
	(check_subobject_offset): Likewise.
	(walk_subobject_offsets): Likewise.
	(record_subobject_offsets): Likewise.
	(layout_conflict_p): Reimplement.
	(layout_nonempty_base_or_field): Correct handling of type
	conflicts during layout.
	(layout_empty_base): Likewise.
	(build_base_field): Adjust to handle new representation of empty
	base offset table.
	(build_base_fields): Likewise.
	(layout_virtual_bases): Likewise.
	(splay_tree_compare_integer_csts): New function.
	(layout_class_type): Use a splay_tree, rather than a varray, to
	represent the offsets of empty bases.

From-SVN: r36958