Hi,
This patch fixes ICE reported by PR81369.  It simply sinks call to
sort_partitions_by_post_order so that it's executed for all cases.
This is necessary to schedule reduction partition as the last one.
Bootstrap and test on x86_64 and AArch64.  Is it OK?

Thanks,
bin
2017-07-12  Bin Cheng  <bin.cheng@arm.com>

	PR target/81369
	* tree-loop-distribution.c (merge_dep_scc_partitions): Sink call to
	function sort_partitions_by_post_order.

gcc/testsuite/ChangeLog
2017-07-12  Bin Cheng  <bin.cheng@arm.com>

	PR target/81369
	* gcc.dg/tree-ssa/pr81369.c: New.