[Bug c/98418] Valid integer constant expressions based on expressions that trigger -Wshift-overflow are treated as non-constants

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98418

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Shifting into the sign bit is problematic. I cant remember the exact rules.
Using ull is valid though.