RFR: 8292562: (fs) Use file cloning in Linux and macOS versions of Files::copy method [v9]

[Alan Bateman]

On Tue, 30 Aug 2022 14:56:55 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> That would be fine with me, but I think the BSD / Linux separation should be done under a different issue with the `clonefile` work remaining under this one. 

That's okay, I think the main important point is that the refactoring is worthy on its own and if we get that queued up before the clonefile then it will make it easier to discuss clonefile.

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PR: https://git.openjdk.org/jdk/pull/9486