[KT-4124] Use generated test to avoid duplication of test data of inner classes. Add support of classes contained within objects.

generators/src/org/jetbrains/kotlin/generators/tests/GenerateTests.kt

@@ -1063,6 +1063,9 @@ fun main(args: Array<String>) {
             model("codegen/box/secondaryConstructors", targetBackend = TargetBackend.JS)
         }
 
+        testClass<AbstractNestedTypesTest>() {
+            model("codegen/box/classes/inner", targetBackend = TargetBackend.JS)
+        }
     }
 }