2019-02-01  Richard Biener  <rguenther@suse.de>

	PR middle-end/88597
	* tree-scalar-evolution.c (analyze_scalar_evolution): Set up
	the instantiate cache.
	(instantiate_scev_binary): Elide second operand procesing
	if equal to the first.
	* tree-chrec.c (chrec_contains_symbols): Add visited set.
	(chrec_contains_undetermined): Likewise.
	(tree_contains_chrecs): Likewise.

	* gcc.dg/torture/pr88597.c: New testcase.

From-SVN: r268449