[Bug c++/88646] Optimizer failure on integer sum overflow cast to bool

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88646

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to gianni from comment #2)
> While it may be undefined, should the result at least be consistent?

No, that's not what undefined means.