[Bug tree-optimization/67666] single restrict pointer in struct looses restrict

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67666

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Looks good to me.  The other possibility is to init ->only_restrict_pointers
from
the single entry.