8022898: java/util/Spliterator/SpliteratorCollisions.java fails in...

8022898: java/util/Spliterator/SpliteratorCollisions.java fails in HashableIntSpliteratorWithNull data provider
Reviewed-by: henryjen, alanb, rriggs

test/java/util/Spliterator/SpliteratorCollisions.java

@@ -148,7 +148,6 @@ public class SpliteratorCollisions {
         List<Object[]> data = new ArrayList<>();
         for (int size : SIZES) {
             List<HashableInteger> exp = listIntRange(size, true);
-            exp.add(0, null);
             SpliteratorDataBuilder<HashableInteger> db = new SpliteratorDataBuilder<>(data, exp);
 
             // Maps