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[libc++] Make __dir_stream visibility declaration consistent
The class `__dir_stream` is currently declared in two places: as a top-level forward declaration in `directory_iterator.h`, and as a friend declaration in class `directory_entry`, in `directory_entry.h`. The former has a `_LIBCPP_HIDDEN` attribute, but the latter does not, causing the Firefox build to complain about the visibility not matching the previous declaration. This is because Firefox plays games with pushing and popping visibility. Work around this by making both `__dir_stream` declarations consistently use `_LIBCPP_HIDDEN`. Reviewed By: ldionne, philnik, #libc Differential Revision: https://reviews.llvm.org/D121639
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