8372809: Test vmTestbase/nsk/jdi/ThreadReference/isSuspended/issuspended001/TestDescription.java failed: JVMTI_ERROR_THREAD_NOT_ALIVE

[plummercj]

Fix a couple of asserts that are now being triggered after the changes for JDK-8282441 were introduced. I had already run into these asserts while working on JDK-8371380, and had already fixed them there. However, JDK-8371380 likely is not going to be pushed for JDK 26, so I have moved the fixes to this PR.

You can also find the fixes I moved over from JDK-8282441 here: https://github.com/openjdk/jdk/pull/28485/files#diff-65eb4035b1d9bb5ceaab430461cd782069fe88c0a7d0438964c041caf0aa5eec

Tested by running failed test case a few hundred times, and also all tier5 CI svc tests, which includes a lot of JDI related testing with virtual threads enabled. Also ran tier1 CI.

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Issue

• JDK-8372809: Test vmTestbase/nsk/jdi/ThreadReference/isSuspended/issuspended001/TestDescription.java failed: JVMTI_ERROR_THREAD_NOT_ALIVE (Bug - P4)

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