Hi,
This patch checks and records if partition can be executed in parallel by
looking if there exists data dependence cycles.  The information is needed
for distribution because the idea is to distribute parallel type partitions
away from sequential ones.  I believe current distribution doesn't work
very well because it does blind distribution/fusion.
Bootstrap and test on x86_64 and AArch64.  Is it OK?

Thanks,
bin
2017-06-07  Bin Cheng  <bin.cheng@arm.com>

	* tree-loop-distribution.c (alias.h): Include header file.
	(enum partition_type): New.
	(struct partition): New field type.
	(partition_merge_into): Update partition type.
	(data_dep_in_cycle_p): New function.
	(build_rdg_partition_for_vertex): Compute partition type.
	(rdg_build_partitions): Dump partition type.