RFR: 8308000: add PopFrame support for virtual threads

[Serguei Spitsyn]

On Tue, 16 May 2023 18:59:38 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

> serviceability/jvmti/vthread/BoundVThreadTest/BoundVThreadTest.java and serviceability/jvmti/vthread/VThreadUnsupportedTest/VThreadUnsupportedTest.java are failing with:
> 
> `PopFrame failed: expected JVMTI_ERROR_OPAQUE_FRAME instead of: 13`

Thanks.
Both tests have the expectation that PopFrame does not support virtual threads.
So,I've removed JVMTI `PopFrame` calls from these two tests.

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PR Comment: https://git.openjdk.org/jdk/pull/14002#issuecomment-1551140674