VN/PRE TLC

VN/PRE TLC

This removes an always true parameter of vn_nary_op_insert_into and moves
valueization to the two callers of vn_nary_op_compute_hash instead of doing it
therein where this function name does not suggest such thing.
Also remove extra valueization from PRE phi-translation.

2021-11-03  Richard Biener  <rguenther@suse.de>

	* tree-ssa-sccvn.c (vn_nary_op_insert_into): Remove always
	true parameter and inline valueization.
	(vn_nary_op_lookup_1): Inline valueization from ...
	(vn_nary_op_compute_hash): ... here and remove it here.
	* tree-ssa-pre.c (phi_translate_1): Do not valueize
	before vn_nary_lookup_pieces.
	(get_representative_for): Mark created SSA representatives
	as visited.