[libcxx-commits] [libcxx] [libc++] Add clang-20 to failing tests on Windows (PR #100119)

[Louis Dionne via libcxx-commits]

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

LGTM. It is true that this is a brittle way to `XFAIL` tests, but it does force us to reconsider whether the XFAIL still makes sense at every release, instead of forever disabling that test coverage.

https://github.com/llvm/llvm-project/pull/100119