tree-loop-distribution.c (struct partition_s): Add has_writes member.

2012-06-05  Richard Guenther  <rguenther@suse.de>

	* tree-loop-distribution.c (struct partition_s): Add has_writes
	member.
	(partition_alloc): Initialize it.
	(partition_has_writes): New function.
	(rdg_flag_uses): Adjust.
	(rdg_flag_vertex): Likewise.
	(rdg_flag_vertex_and_dependent): Likewise.
	(rdg_flag_loop_exits): Likewise.
	(build_rdg_partition_for_component): Likewise.
	(rdg_build_partitions): Likewise.

From-SVN: r188233