[Bug tree-optimization/64450] Optimize 0>=p-q to q>=p for char*p,*q;

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64450

--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
See also PR61734, Eric already tried in May.