[libcxx-commits] [libcxx] [libc++] Add `ranges::fold_left_first` and ranges::`fold_left_first_with_iter` (PR #121558)

[A. Jiang via libcxx-commits]

frederick-vs-ja wrote:

I think we're very near to landing this. Let's add notes to `libcxx/docs/ReleaseNotes/21.rst`.

https://github.com/llvm/llvm-project/pull/121558