[Bug c/122462] -fwrapv-pointer suppresses optimization but not -Waddress warning in pointer arithmetic with NULL

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122462

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think this needs -fno-delete-null-pointer-checks as well to reliably suppress
optimization.