re PR tree-optimization/84746 (ICE on valid code at -O2 and -O3: Segmentation fault)

re PR tree-optimization/84746 (ICE on valid code at -O2 and -O3: Segmentation fault)

2018-03-08  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/84746
	* tree-ssa-pre.c (find_leader_in_sets): Deal with SET1 being NULL.
	(phi_translate): Pass in destination ANTIC_OUT set.
	(phi_translate_1): Likewise.  For a simplified result lookup
	a leader in ANTIC_OUT and AVAIL_OUT, not the ANTIC_IN sets.
	(phi_translate_set): Adjust.
	(do_pre_regular_insertion): Likewise.
	(do_pre_partial_partial_insertion): Likewise.

	* gcc.dg/torture/pr84746.c: New testcase.

From-SVN: r258361