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

[Coleen Phillimore]

On Wed, 16 Nov 2022 03:54:31 GMT, Serguei Spitsyn <sspitsyn at openjdk.org> wrote:

>> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Review comments.
>
> src/hotspot/share/prims/jvmtiEnvBase.cpp line 564:
> 
>> 562: 
>> 563:   for (int i = 0; i < length; i++) {
>> 564:     objArray[i] = (jthreadGroup)JNIHandles::make_local(groups->obj_at(i));
> 
> Nit: It is better to use `jni_reference` instead of `JNIHandles::make_local` for consistency as at the line 549.

jni_reference takes a Handle and this passes a Handle to an objArray so groups->obj_at(i) is an oop and it's a waste to make it a handle for jni_reference to just unhandlize it.

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