Use Collections.addAll instead of Collection.addAll

See gh-24636

spring-core/src/main/java/org/springframework/util/CollectionUtils.java

@@ -129,9 +129,7 @@ public abstract class CollectionUtils {
 	@SuppressWarnings("unchecked")
 	public static <E> void mergeArrayIntoCollection(@Nullable Object array, Collection<E> collection) {
 		Object[] arr = ObjectUtils.toObjectArray(array);
-		for (Object elem : arr) {
+		Collections.addAll(collection, (E[])arr);
-			collection.add((E) elem);
-		}
 	}
 
 	/**