RFR: 8302615: make JVMTI thread cpu time functions optional for virtual threads

[Alan Bateman]

On Thu, 16 Feb 2023 18:05:54 GMT, Serguei Spitsyn <sspitsyn at openjdk.org> wrote:

> This is a minor JVM TI spec update for two timer functions `GetCurrentThreadCpuTime` and `GetThreadCpuTime` to allow implementations to support virtual threads.
> 
> The CSR is:
> [JDK-8302616](https://bugs.openjdk.org/browse/JDK-8302616): make JVMTI thread cpu time functions optional for virtual threads
> 
> No testing is needed.

Marked as reviewed by alanb (Reviewer).

I assume we'll rev the JVMTI version at some point in 21.

The change looks fine. It might be that we'll need to add a new capacity or add a field to jvmtiTimerInfo to say whether the implementation supports CPU time for virtual threads, but what we have now is okay.

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PR: https://git.openjdk.org/jdk/pull/12604