use kotlin Iterable/Iterator

instead of java Iterable/Iterator
in Kotlin code in tests

compiler/testData/readJavaBinaryClass/InnerClassesInGeneric.java

@@ -6,7 +6,7 @@ public class InnerClassesInGeneric<P, Q> {
     public class Inner {
     }
     
-    public class Inner2 extends Inner implements Iterable<P> {
+    public class Inner2 extends Inner {
         public java.util.Iterator<P> iterator() {
             throw new UnsupportedOperationException();
         }