[Bug c/64440] -Wdiv-by-zero false negative on const variables

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64440

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
In C, const int is not a constant expression and -Wdiv-by-zero only warns about
integer constant expressions.