[Bug tree-optimization/91227] pointer relational expression not folded but equivalent inequality is

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91227

--- Comment #14 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Florian Weimer from comment #13)
> I don't see why I cast should magically fix this issue,

In libstdc++, std::less<T*> does such a cast, there were discussions about it
at that time.