[flang] [clang] [openmp] [libcxx] [lld] [lldb] [clang-tools-extra] [llvm] [mlir] [compiler-rt] [libc] [libc++][streams] P1759R6: Native handles and file streams (PR #76632)

[Mark de Wever via llvm-commits]

https://github.com/mordante requested changes to this pull request.

LGTM modulo some nits. I like to have a quick look at the final version before approving.

https://github.com/llvm/llvm-project/pull/76632