[Bug c++/110338] Implement C++26 language features

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110338
Bug 110338 depends on bug 110348, which changed state.

Bug 110348 Summary: [C++26] P2741R3 - User-generated static_assert messages
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110348

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