2016-08-11  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/72772
	* cfgloopmanip.c (create_preheader): Use split_edge if there
	is a single loop entry, avoiding degenerate PHIs.

	* gcc.dg/graphite/pr35356-1.c: Adjust.
	* gcc.dg/tree-ssa/pr59597.c: Likewise.

From-SVN: r239357