RFR: JDK-8302129: Make MetaspaceReclaimPolicy a diagnostic switch

[David Holmes]

On Mon, 13 Feb 2023 17:11:05 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> See associated CSR for background and motivation: https://bugs.openjdk.org/browse/JDK-8302130 .
> 
> This patch is technically trivial. CSR is approved.

There seem to be tests using this flag which do not unlock diagnostic options. IIRC debug VMs unlock by default but for product you will need to unlock explicitly.

Thanks.

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Changes requested by dholmes (Reviewer).

PR: https://git.openjdk.org/jdk/pull/12540