RFR: 8365807: (fs) Two-arg UnixFileAttributes.getIfExists should not use exception for control flow [v2]

[Brian Burkhalter]

On Fri, 22 Aug 2025 16:45:26 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> UnixFileAttributes.getIfExists is performance critical so this is why it the native method returns errno rather than throws.

So the `stat0` and `fstatat0` methods should revert to returning `errno`.

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PR Comment: https://git.openjdk.org/jdk/pull/26889#issuecomment-3215001314