8255299: Drop explicit zeroing at instantiation of Atomic* objects

Reviewed-by: redestad, serb, prr

src/java.base/share/classes/java/lang/invoke/InnerClassLambdaMetafactory.java

@@ -87,7 +87,7 @@ import static jdk.internal.org.objectweb.asm.Opcodes.*;
     private static final String[] EMPTY_STRING_ARRAY = new String[0];
 
     // Used to ensure that each spun class name is unique
-    private static final AtomicInteger counter = new AtomicInteger(0);
+    private static final AtomicInteger counter = new AtomicInteger();
 
     // For dumping generated classes to disk, for debugging purposes
     private static final ProxyClassesDumper dumper;

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

@@ -120,7 +120,7 @@ public class Timer {
     /**
      * This ID is used to generate thread names.
      */
-    private static final AtomicInteger nextSerialNumber = new AtomicInteger(0);
+    private static final AtomicInteger nextSerialNumber = new AtomicInteger();
     private static int serialNumber() {
         return nextSerialNumber.getAndIncrement();
     }

src/java.base/share/classes/java/util/stream/AbstractShortCircuitTask.java

@@ -68,7 +68,7 @@ abstract class AbstractShortCircuitTask<P_IN, P_OUT, R,
     protected AbstractShortCircuitTask(PipelineHelper<P_OUT> helper,
                                        Spliterator<P_IN> spliterator) {
         super(helper, spliterator);
-        sharedResult = new AtomicReference<>(null);
+        sharedResult = new AtomicReference<>();
     }
 
     /**