8166840: Synthetic bridge constructor in ArrayList$Itr blocks inlining

Reviewed-by: vlivanov, mhaupt, forax

src/share/classes/java/util/ArrayList.java

@@ -842,6 +842,8 @@ public class ArrayList<E> extends AbstractList<E>
         int lastRet = -1; // index of last element returned; -1 if no such
         int expectedModCount = modCount;
 
+        Itr() {}
+
         public boolean hasNext() {
             return cursor != size;
         }