runtime/Thread/StopAtExit.java failing in loom repo

This test depends on a private method in ThreadGroup and book keeping that does not exist in the loom repo. In addition the async exception leads to exceptions in class loading when the victim thread exits - this surfaces in the main thread when it attempts to invoke a method in that class.

Exception: java.lang.ThreadDeath thrown from the UncaughtExceptionHandler in thread "Thread-1"
java.lang.NoClassDefFoundError: Could not initialize class java.lang.Thread$State
at java.base/jdk.internal.misc.VM.toThreadState(VM.java:348)
at java.base/java.lang.Thread.threadState(Thread.java:2777)
at java.base/java.lang.Thread.getThreadGroup(Thread.java:1963)
at java.base/java.lang.ThreadGroup.activeCount(ThreadGroup.java:364)
at StopAtExit.main(StopAtExit.java:127)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:577)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:1532)

Excluding the test for now, need to decide if this test should be deleted in the loom repo.