[Bug libstdc++/102090] Placement-new is not constexpr

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102090

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I don't think inplacement new is valid for constexpr.  See PR 61105 also.