Introduce Common protected function AbstractMutableList.removeRange #KT-57151

libraries/stdlib/js/src/kotlin/collections/AbstractMutableList.kt

@@ -81,7 +81,7 @@ public actual abstract class AbstractMutableList<E> protected actual constructor
     /**
      * Removes the range of elements from this list starting from [fromIndex] and ending with but not including [toIndex].
      */
-    protected open fun removeRange(fromIndex: Int, toIndex: Int) {
+    protected actual open fun removeRange(fromIndex: Int, toIndex: Int) {
         val iterator = listIterator(fromIndex)
         repeat(toIndex - fromIndex) {
             iterator.next()