RFR: 8296492: Remove ObjectLocker in JVMTI get_subgroups call [v6]

[Alan Bateman]

On Tue, 15 Nov 2022 18:52:37 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> The JVM code took a ThreadGroup lock before poking into ThreadGroup fields.  Call a method in the ThreadGroup to call the synchronized method instead.
>> Tested with tier 1-4.
>
> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Review comments.

Marked as reviewed by alanb (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/11033