RFR: 8294399: (ch) Refactor some methods out of sun.nio.ch.UnixFileDispatcherImpl [v4]

[Alan Bateman]

On Wed, 26 Oct 2022 19:42:43 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> Interpose a new class `sun.nio.ch.UnixDispatcher` between `sun.nio.ch.NativeDispatcher` and its current subclasses `sun.nio.ch.DatagramDispatcher` and `sun.nio.ch.SocketDispatcher`; refactor some methods out of `sun.nio.ch.UnixFileDispatcherImpl` into this updated hierarchy.
>
> Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8294399: Move UnixDispatcher_init() before the other JNI methods

Marked as reviewed by alanb (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/10434