[libcxx-commits] [libcxx] [libcxx][test] Change UNSUPPORTED to XFAIL in lit tests (PR #81513)

[Mark de Wever via libcxx-commits]

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

Thanks also for the other cleanups. Please wait with landing until the CI is green.

https://github.com/llvm/llvm-project/pull/81513