graphite-scop-detection.c (scop_detection::can_represent_loop): Do not iterate to sibling loops but only to siblings of inner loops.

2017-09-19  Richard Biener  <rguenther@suse.de>

	* graphite-scop-detection.c (scop_detection::can_represent_loop):
	Do not iterate to sibling loops but only to siblings of inner
	loops.

From-SVN: r252962