8365192: post_meth_exit should be in vm state when calling get_jvmti_thread_state

[lmesnik]

The method
get_jvmti_thread_state()
should be called only while thread is in vm state.

The post_method_exit is doing some preparation before switching to vm state. This cause issues if thread is needed to initialize jvmti thread state.

The fix was found using jvmti stress agent and thus no additional regression test is required.

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Issue

• JDK-8365192: post_meth_exit should be in vm state when calling get_jvmti_thread_state (Bug - P4)

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[mlbridge]

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[sspitsyn]

Thank you for catching and addressing this! How was the fix tested?
It looks okay at a glance but may give surprises.

[lmesnik]

I ran tier1-5 testing and separately verified that test pass with jvmti strass agent.