RFR: 8308000: add PopFrame support for virtual threads

[Serguei Spitsyn]

On Tue, 16 May 2023 18:56:05 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

> You still have the following test problem listed. It seems to be passing now:
> 
> `vmTestbase/nsk/jvmti/PopFrame/popframe004/TestDescription.java 8300708 generic-all`

You probably mean when executed in a virtual thread mode, right?
As I understand this mode was not available just a week ago. Will try to run the nsk tests in this mode now.

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PR Comment: https://git.openjdk.org/jdk/pull/14002#issuecomment-1550816600