8295951: intermittent cmp_baseline task failures with CDS files

Backport-of: e193a0b72a143889170b64da19fb22f7f8555e89

make/jdk/src/classes/build/tools/classlist/HelloClasslist.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2016, 2023, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -147,6 +147,12 @@ public static void main(String ... args) throws Throwable {
         invoke(handle("staticMethod_V", MethodType.methodType(void.class)));
 
         LOGGER.log(Level.FINE, "New Date: " + newDate + " - old: " + oldDate);
+
+        // The Striped64$Cell is loaded rarely only when there's a contention among
+        // multiple threads performing LongAdder.increment(). This results in
+        // an inconsistency in the classlist between builds (see JDK-8295951).
+        // To avoid the problem, load the class explicitly.
+        Class<?> striped64Class = Class.forName("java.util.concurrent.atomic.Striped64$Cell");
     }
 
     public HelloClasslist() {}