Withdrawn: 8303934: (fc) Use splice in FileChannel::transferFrom when the source is a pipe (Linux)

[duke]

On Fri, 10 Mar 2023 00:35:38 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> On Linux, perform `transferFrom()` via the `splice(2)` system call when the source `ReadableByteChannel` is a `Pipe.SourceChannel` (`sun.nio.ch.SourceChannelImpl`).

This pull request has been closed without being integrated.

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PR: https://git.openjdk.org/jdk/pull/12965