RFR: 8319876: Reduce memory consumption of VM_ThreadDump::doit [v3]

[Long Yang]

On Fri, 17 Nov 2023 05:57:37 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Long Yang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Use VMThread::vm_thread() to avoid the need to call Thread::current()
>
> Our testing passed tiers 1-5. Thanks

@dholmes-ora David Thanks.

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PR Comment: https://git.openjdk.org/jdk/pull/16598#issuecomment-1815842644