[Bug libstdc++/126716] under _GLIBCXX_DEBUG, std::erase_if on unordered container with transparent comparator fails to compile in C++23

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126716

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I think __erase_nodes_if was broken by r12-5431-g5f40d34b6dd30e but the bug was
latent until the heterogeneous erase was added to __debug::unordered_xxx