[jdk21] RFR: 8254566: Clarify the spec of ClassLoader::getClassLoadingLock for non-parallel capable loader

[Iris Clark]

On Mon, 3 Jul 2023 16:23:43 GMT, Mandy Chung <mchung at openjdk.org> wrote:

> Backport of commit [b9198f99](https://github.com/openjdk/jdk/commit/b9198f993173b0fbdc7ff1400e2205d3969370da).

Looks identical to change in 22, as expected.

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Marked as reviewed by iris (Reviewer).

PR Review: https://git.openjdk.org/jdk21/pull/93#pullrequestreview-1511522916