[Bug libstdc++/115285] [13/14/15 Regression] std::unordered_set can have duplicate values since r13-1114

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115285

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Though I think the standard says only one is entered rather than both ... But
not which one.