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

[Brian Burkhalter]

On Tue, 30 Aug 2022 15:06:24 GMT, Alan Bateman <alanb 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 [...].

Probably then I'll file two new issues: one for the refactoring and a sub-task for `copy_file_range` and change the topic of the current sub-task to `clonefile`. The sub-tasks will both be blocked by the refactoring.

-------------

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