2019-11-15  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/92039
	PR tree-optimization/91975
	* tree-ssa-loop-ivcanon.c (constant_after_peeling): Revert
	previous change, treat invariants consistently as non-constant.
	(tree_estimate_loop_size): Ternary ops with just the first op
	constant are not optimized away.

	* gcc.dg/tree-ssa/cunroll-2.c: Revert to state previous to
	unroller adjustment.
	* g++.dg/tree-ssa/ivopts-3.C: Likewise.

From-SVN: r278281