[Bug tree-optimization/108635] Redundant calls to C++ spaceship operator<=> with attribute pure or const

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108635

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I suspect you need noexcept too. Otherwise you could in theory have an
exception.