RFR: 8296492: Remove ObjectLocker in JVMTI get_subgroups call [v5]

[David Holmes]

On Tue, 8 Nov 2022 14:55:17 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:
> 
>   Forgot a null check.

src/hotspot/share/prims/jvmtiEnvBase.cpp line 540:

> 538: 
> 539: jthread *
> 540: JvmtiEnvBase::new_jthreadArray(int length, Handle *handles) {

Shouldn't this method need to cast the return value to `jthread*`? And potentially shouldn't all the jobject's now be jthread's?

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