[libcxx-commits] [libcxx] [libc++] Use __datasizeof for __libcpp_datasizeof if available (PR #72104)

[Mark de Wever via libcxx-commits]

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

I see the changes in Clang have landed a few days ago. Can you update the CI image and then re-run the CI for this patch. Then we're sure the branch of
`#if __has_extension(datasizeof)` is taken and passes the CI.

https://github.com/llvm/llvm-project/pull/72104