E.g. on AIx we run into this test failure :
error: module not found: jdk.hotspot.agent
Unable to retrieve `@since` for Module: module: jdk.hotspot.agent
java.lang.Exception: The `@since` checker found 1 problems
at SinceChecker.checkModule(SinceChecker.java:284)
at SinceChecker.main(SinceChecker.java:145)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:565)
at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:333)
at java.base/java.lang.Thread.run(Thread.java:1447)

So we should probably limit the execution of this test to jdk with sa support.