[libcxx-commits] [libcxx] [libc++][RFC] Only include what is required by-version in the umbrella headers (PR #83740)

[Louis Dionne via libcxx-commits]

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

This direction LGTM. There are a few bugs as pointed out by Mark, but with those fixed I think this patch makes a lot of sense.

https://github.com/llvm/llvm-project/pull/83740