[Bug tree-optimization/92963] Optimization with `restrict`: is `p == q ? p : q` "based" on `p`?

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92963

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Take:

    if (p == q)
        r = p;
    else
        r = q;

p cannot be q as they cannot be based on each other based on my reading of
6.7.3.1p3.

Therefore r is only ever based on q.