RFR: 8338383: Implement JEP 491: Synchronize Virtual Threads without Pinning [v23]

[Patricio Chilano Mateo]

On Wed, 30 Oct 2024 23:22:42 GMT, Dean Long <dlong at openjdk.org> wrote:

>> `PreemptStatus` is meant to be used with `tryPreempt()` which is not implemented yet, i.e. there is no method yet that maps between these values and the PreemptStatus enum. The closest is `Continuation.pinnedReason` which we do use. So if you want I can remove the reference to PreemptStatus and use pinnedReason instead.
>
> Yes, that would be better for now.

Changed.

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PR Review Comment: https://git.openjdk.org/jdk/pull/21565#discussion_r1824788898