2017-04-24  Richard Biener  <rguenther@suse.de>

	* tree-ssa-sccvn.h (run_scc_vn): Adjust prototype.
	* tree-ssa-sccvn.c (print_scc): Print SCC size.
	(extract_and_process_scc_for_name): Never fail but drop SCC to varying.
	(DFS): Adjust and never fail.
	(sccvn_dom_walker::fail): Remove.
	(sccvn_dom_walker::before_dom_children): Adjust.
	(run_scc_vn): Likewise and never fail.
	* tree-ssa-pre.c (pass_pre::execute): Adjust.
	(pass_fre::execute): Likewise.

From-SVN: r247092