tree-ssa-pre.c (compute_antic_aux): Remove code that asserts that the value-set of ANTIC_IN doesn't grow.

2018-03-14  Richard Biener  <rguenther@suse.de>

	* tree-ssa-pre.c (compute_antic_aux): Remove code that asserts
	that the value-set of ANTIC_IN doesn't grow.

	Revert
	* tree-ssa-pre.c (struct bb_bitmap_sets): Add visited_with_visited_succs
	member.
	(BB_VISITED_WITH_VISITED_SUCCS): New define.
	(compute_antic): Initialize BB_VISITED_WITH_VISITED_SUCCS.

From-SVN: r258520