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

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110339
Bug 110339 depends on bug 118341, which changed state.

Bug 118341 Summary: Missing -D_GLIBCXX_ASSERTIONS checks for <bitset>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118341

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