[llvm-branch-commits] [libcxx] release/20.x: [libcxx] Add a missing include for __bit_iterator (#127015) (PR #131382)

[Louis Dionne via llvm-branch-commits]

ldionne wrote:

I'd like us to validate that this is the right fix on `main` first. I've asked for a reproducer in #127015.

https://github.com/llvm/llvm-project/pull/131382