[jdk20] RFR: 8295857: Clarify that cleanup code can be skipped when the JVM terminates (e.g. when calling halt())

[Iris Clark]

On Mon, 12 Dec 2022 19:51:22 GMT, Brent Christian <bchristi at openjdk.org> wrote:

> Backport [8295857](https://bugs.openjdk.org/browse/JDK-8295857) to jdk20

Changes appear to be identical to those in JDK 21.

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Marked as reviewed by iris (Reviewer).

PR: https://git.openjdk.org/jdk20/pull/19