[Bug c++/125821] Implement C++29 language features

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125821
Bug 125821 depends on bug 125837, which changed state.

Bug 125837 Summary: [C++29] P3540R3, #embed offset parameter
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125837

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