RFR: 8293331: Refactor FileDispatcherImpl into operating system-specific components [v5]

[Alan Bateman]

On Tue, 20 Sep 2022 01:51:37 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> Break up `sun.nio.ch.FileChannelImpl` in a manner similar but not identical to the refactoring of `sun.nio.fs.UnixFileSystem` performed in #10093.
>
> Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8293331: Fix static initialization order on Windows

The overall refactoring looks okay. Most of the change is code moving to another file so it's hard to see if there are any changes and it's hard to see if the list of include files is accurate. Everything I checked seemed okay and unchanged.

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Marked as reviewed by alanb (Reviewer).

PR: https://git.openjdk.org/jdk/pull/10154