2019-07-05  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/91091
	* tree-ssa-alias.h (get_continuation_for_phi): Add tbaa_p parameter.
	(walk_non_aliased_vuses): Likewise.
	* tree-ssa-alias.c (maybe_skip_until): Pass down tbaa_p.
	(get_continuation_for_phi): New tbaa_p parameter and pass
	it down.
	(walk_non_aliased_vuses): Likewise.
	* ipa-prop.c (determine_known_aggregate_parts): Adjust.
	* tree-ssa-pre.c (translate_vuse_through_block): Likewise.
	* tree-ssa-scopedtables.c (avail_exprs_stack::lookup_avail_expr):
	Likewise.
	* tree-ssa-sccvn.c (struct vn_walk_cb_data): Add tbaa_p flag.
	(adjust_offsets_for_equal_base_address): New function.
	(vn_reference_lookup_3): Use it to catch more base equivalences.
	Handle and pass down tbaa_p flag.
	(vn_reference_lookup_pieces): Adjust.
	(vn_reference_lookup): Remove alias-set altering, instead pass
	down false as tbaa_p.

	* gcc.dg/tree-ssa/pr91091-2.c: New testcase.
	* gcc.dg/tree-ssa/ssa-fre-70.c: Likewise.
	* gcc.dg/tree-ssa/ssa-fre-71.c: Likewise.
	* gcc.dg/tree-ssa/ssa-fre-72.c: Likewise.

From-SVN: r273135