[Bug c++/113582] incorrect warning about unused label with `pragma GCC diagnostic` around the unused label

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113582

--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Patch approved for GCC 15:
https://gcc.gnu.org/pipermail/gcc-patches/2024-January/643999.html