runtime/Thread/StopAtExit.java needs updating

Thread.stop(), ThreadGroup.destroy(), ThreadGroup.isDestroyed(),
ThreadGroup.setDaemon() are deprecated for removal:

----------direct:(19/1707)----------
/System/Volumes/Data/work/shared/bug_hunt/thread_SMR_stress/jdk19_exp.git/open/test/hotspot/jtreg/runtime/Thread/StopAtExit.java:91: warning: [removal] setDaemon(boolean) in ThreadGroup has been deprecated and marked for removal
            myTG.setDaemon(true);
                ^
/System/Volumes/Data/work/shared/bug_hunt/thread_SMR_stress/jdk19_exp.git/open/test/hotspot/jtreg/runtime/Thread/StopAtExit.java:101: warning: [removal] stop() in Thread has been deprecated and marked for removal
                    thread.stop();
                          ^
/System/Volumes/Data/work/shared/bug_hunt/thread_SMR_stress/jdk19_exp.git/open/test/hotspot/jtreg/runtime/Thread/StopAtExit.java:125: warning: [removal] stop() in Thread has been deprecated and marked for removal
            thread.stop();
                  ^
/System/Volumes/Data/work/shared/bug_hunt/thread_SMR_stress/jdk19_exp.git/open/test/hotspot/jtreg/runtime/Thread/StopAtExit.java:142: warning: [removal] isDestroyed() in ThreadGroup has been deprecated and marked for removal
                if (!myTG.isDestroyed()) {
                         ^
/System/Volumes/Data/work/shared/bug_hunt/thread_SMR_stress/jdk19_exp.git/open/test/hotspot/jtreg/runtime/Thread/StopAtExit.java:146: warning: [removal] isDestroyed() in ThreadGroup has been deprecated and marked for removal
            } else if (!myTG.isDestroyed()) {
                            ^
/System/Volumes/Data/work/shared/bug_hunt/thread_SMR_stress/jdk19_exp.git/open/test/hotspot/jtreg/runtime/Thread/StopAtExit.java:154: warning: [removal] destroy() in ThreadGroup has been deprecated and marked for removal
                    myTG.destroy();
                        ^
6 warnings
result: Passed. Compilation successful


Will be switching from java.lang.Thread.stop() to JVM/TI StopThread().
Will also be cleaning up the error handling since the JVM/TI APIs
actually return error codes.

The java.lang.ThreadGroup.destroy(), ThreadGroup.isDestroyed(),
ThreadGroup.setDaemon() methods are used for cleaning up
memory leaks that can be caused by async exception delivery.
After the fix for:

    JDK-8282952 Thread::exit should be immune to Thread.stop

is integrated, the code that does that cleanup should not be
necessary. However, I may do cleanup as a separate RFE.