[Bug libstdc++/100863] 23_containers/unordered_{map,set}/allocator/default_init.cc still fail at runtime even after r12-1153

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100863

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Do we ever want the _Hashtable_ebo_helper<N, T> to *not* value-init its T
subobject? I think we should do the value-init in _Hashtable_ebo_helper
instead.