RFR: 8303083: (bf) Remove private DirectByteBuffer(long, int) constructor before JDK 21 GA

[Brian Burkhalter]

On Fri, 24 Feb 2023 17:06:36 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> Remove the `DirectByteBuffer` constructor what was originally removed by #11873 and subsequently reinstated #12717.

Top three test tiers pass on all platforms.

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PR: https://git.openjdk.org/jdk/pull/12745