RFR: 8343177: JFR: Remove critical section for thread id assignment [v3]

[Markus Grönlund]

On Fri, 1 Nov 2024 12:44:56 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Markus Grönlund has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   rename primordial to main thread
>
> Marked as reviewed by dholmes (Reviewer).

Thanks @dholmes-ora for your review.

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PR Comment: https://git.openjdk.org/jdk/pull/21756#issuecomment-2451874805