[Bug libstdc++/60921] 'final' allocators are incompatible with the Empty Base-class Optimisation

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60921
Bug 60921 depends on bug 51365, which changed state.

Bug 51365 Summary: cannot use final empty class in std::tuple
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51365

           What    |Removed                     |Added
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             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED