[libcxx-commits] [libcxx] [libc++] Fix ABI tag mismatches during C++20 module deserialization (PR #213495)

[Louis Dionne via libcxx-commits]

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

I looked through a couple of files and I am seeing changes that are not just adding `_LIBCPP_HIDE_FROM_ABI`. Can you explain what those changes are and why they're being made in this patch?

https://github.com/llvm/llvm-project/pull/213495