RFR: 8299275: Add some ClassLoaderData verification code [v3]

[Frederic Parain]

On Fri, 6 Jan 2023 20:03:34 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> I added some verification code to try to help track down JDK-8296915 (https://bugs.openjdk.org/browse/JDK-8296915).
>> Ran Test: runtime/SelectionResolution/InvokeInterfaceSuccessTest.java 100x with -XX:+VerifyBefore/AfterGC.
>> Tested with tier1-4.
>
> Coleen Phillimore has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Fix some english.
>  - Walk other non-mirror oops in CLD::_handles area and add a comment why not mirrors.

Looks good to me.
Thank you for the comment about mirrors.

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Marked as reviewed by fparain (Committer).

PR: https://git.openjdk.org/jdk/pull/11856