tree-loop-distribution.c (struct partition): New field recording its data reference.

tree-loop-distribution.c (struct partition): New field recording its data reference.

	* tree-loop-distribution.c (struct partition): New field recording
	its data reference.
	(partition_alloc, partition_free): Init and release data refs.
	(partition_merge_into): Merge data refs.
	(build_rdg_partition_for_vertex): Collect data refs for partition.
	(pg_add_dependence_edges): Change parameters from vector to bitmap.
	Update uses.
	(distribute_loop): Remve data refs from vertice data of partition
	graph.

From-SVN: r249989