Add more stub generator tests for external dependencies

compiler/testData/ir/irText/stubs/javaInnerClass.kt

@@ -0,0 +1,18 @@
+// !DUMP_DEPENDENCIES
+// FILE: J.java
+
+public class J {
+    public class JInner {
+        public void foo() {}
+        public int z = 0;
+    }
+    public void bar() {}
+    public int x = 0;
+}
+
+// FILE: javaInnerClass.kt
+
+class Test1 : J() {
+    val test = JInner()
+}
+