[Bug tree-optimization/89509] restrict doesnt work with subfield accesses

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89509

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 45827
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45827&action=edit
the patch