RFR: 6980847: (fs) Files.copy needs to be tuned [v6]

[kristylee88]

On Fri, 17 Jun 2022 15:37:53 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> Modify `UnixCopyFile.copyFile()` to set the transfer size to the least common multiple of the source and destination file block sizes if the block sizes are not equal. Modify `WindowsFileCopy.copy()` to set `COPY_FILE_NO_BUFFERING` in the flags passed to `CopyFileEx()` if the size of the transfer is greater than a threshold.
>
> Brian Burkhalter has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - 6980847: Convert to fallback to copy0() method
>  - 6980847: work in progress

Marked as reviewed by kristylee88 at github.com (no known OpenJDK username).

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PR: https://git.openjdk.org/jdk/pull/9161