[Bug c++/95334] GCC detect missing signed-integer-overflow when add "const"

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95334

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
My guess is that G++ folds the constants early and the overflow happens at
compile time, so is never seen by UBsan.