[libcxx-commits] [libcxx] [libc++] Move the contents of `__fwd/get.h` into the forward declaration headers they actually belong to (PR #81368)

[Mark de Wever via libcxx-commits]

https://github.com/mordante approved this pull request.

Thanks! LGTM!

https://github.com/llvm/llvm-project/pull/81368