re PR tree-optimization/26197 (ICE in is_old_name with vectorizer)
PR tree-optimization/26197
* tree-ssa-alias.c (new_type_alias): Takes additional argument. Calls
get_ref_base_and_extent and overlap_subvar to add only relevant
subvars as may-aliases.
(add_may_alias_for_new_tag): New function, factored out of
new_type_alias.
* tree-vect-transform.c (vect_create_data_ref_ptr): Call new_type_alias
with additional argument.
* tree-flow.h (new_type_alias): Takes additional argument.
From-SVN: r116060