8275688: Suppress warnings on non-serializable non-transient instance fields in DualPivotQuicksort

Reviewed-by: rriggs

Author: jddarcy

src/java.base/share/classes/java/util/DualPivotQuicksort.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2009, 2021, 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
@@ -3997,6 +3997,7 @@ private static void mergeParts(Merger merger, double[] dst, int k,
      */
     private static final class Sorter extends CountedCompleter<Void> {
         private static final long serialVersionUID = 20180818L;
+        @SuppressWarnings("serial")
         private final Object a, b;
         private final int low, size, offset, depth;
 
@@ -4066,6 +4067,7 @@ private void forkSorter(int depth, int low, int high) {
      */
     private static final class Merger extends CountedCompleter<Void> {
         private static final long serialVersionUID = 20180818L;
+        @SuppressWarnings("serial")
         private final Object dst, a1, a2;
         private final int k, lo1, hi1, lo2, hi2;
 
@@ -4115,6 +4117,7 @@ private void forkMerger(Object dst, int k,
      */
     private static final class RunMerger extends RecursiveTask<Object> {
         private static final long serialVersionUID = 20180818L;
+        @SuppressWarnings("serial")
         private final Object a, b;
         private final int[] run;
         private final int offset, aim, lo, hi;