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

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110339
Bug 110339 depends on bug 120364, which changed state.

Bug 120364 Summary: std::bitset is missing hardened preconditions
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120364

           What    |Removed                     |Added
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             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |DUPLICATE