[libc-commits] [libc] [libc][c23] add memset_explicit (PR #83577)

[Nick Desaulniers via libc-commits]

https://github.com/nickdesaulniers requested changes to this pull request.

Until the standard says we must memset differently then I'm not willing to accept the complexity of doing something different in our memset to support `memset_explicit`.

https://github.com/llvm/llvm-project/pull/83577