[Misc] Fixes test failures after merge jdk8u262-ga

Summary: added help methods to Asserts.java

Test Plan: jdk/test

Reviewed-by: kuaiwei, sanhong

Issue: https://github.com/alibaba/dragonwell8/issues/108

test/lib/testlibrary/jdk/testlibrary/Asserts.java

@@ -408,6 +408,22 @@ public class Asserts {
         }
     }
 
+    /**
+     * Fails a test with the default message.
+     */
+    public static void fail() {
+        error("Test failed");
+    }
+
+    /**
+     * Fails a test with the given message.
+     *
+     * @param msg A description of the failure.
+     */
+    public static void fail(String msg) {
+        error(msg);
+    }
+
     private static <T extends Comparable<T>> int compare(T lhs, T rhs, String msg) {
         assertNotNull(lhs, msg);
         assertNotNull(rhs, msg);