[Bug libstdc++/110339] Implement C++26 library features

[ncm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110339
Bug 110339 depends on bug 119739, which changed state.

Bug 119739 Summary: [C++26] Implement P0952R2, A new specification for std::generate_canonical
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119739

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