2017-04-21  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/80237
	* tree-ssa-pre.c (find_leader_in_sets): Add third set argument,
	defaulted to NULL.
	(phi_translate_1): Also allow a leader in AVAIL_OUT of pred
	for a simplified result.

	* gcc.dg/tree-ssa/tailcall-9.c: New testcase.
	* gcc.dg/tree-ssa/ldist-pr45948.c: Remove undefined behavior,
	adjust expected optimizations.

From-SVN: r247049