tree-ssa-alias.c (nonoverlapping_component_refs_p_1): Break out from ...; work also on duplicated types.

	* tree-ssa-alias.c (nonoverlapping_component_refs_p_1): Break out
	from ...; work also on duplicated types.
	(nonoverlapping_component_refs_since_match): ... here
	(ncr_type_uid): Break out from ...
	(ncr_compar): ... here; look for TYPE_UID of canonical type if
	available.
	(nonoverlapping_component_refs_p): Use same_type_for_tbaa to match
	the types and nonoverlapping_component_refs_p_1 to disambiguate.
	* g++.dg/lto/alias-3_0.C: New file.
	* g++.dg/lto/alias-3_1.c: New file.

From-SVN: r273322