re PR tree-optimization/86865 (Wrong code w/ -O2 -floop-parallelize-all -fstack-reuse...

re PR tree-optimization/86865 (Wrong code w/ -O2 -floop-parallelize-all -fstack-reuse=none -fwrapv -fno-tree-ch -fno-tree-dce -fno-tree-dominator-opts -fno-tree-loop-ivcanon)

2019-01-25  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/86865
	* graphite-scop-detection.c (scop_detection::can_represent_loop):
	Reject non-do-while loops.

	* gcc.dg/graphite/pr86865.c: New testcase.
	* gcc.dg/graphite/pr69728.c: XFAIL.
	* gcc.dg/graphite/scop-21.c: Likewise.

From-SVN: r268257