RFR: 8304303: implement VirtualThread class notifyJvmti methods as C2 intrinsics [v4]

[Serguei Spitsyn]

On Sat, 18 Mar 2023 11:24:47 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> The most important case is when there is no JVMTI env. If I read the changes correctly, the overhead for park/continue changes from one volatile-read (notifyJvmtiEvents) to two plain-writes (JavaThread::_is_in_VTMS_transition).
> 
> If a JVMTI env has been created then there is no benefit for the moment as there is still a call into the runtime to interact with JvmtiVTMSTransitionDisabler. So I think you are saying that is for follow-on PRs.
@AlanBateman Yes, your conclusion is correct.

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PR: https://git.openjdk.org/jdk/pull/13054