tests: Update external tests (1.1.2-dev-393)

backend.native/tests/external/codegen/box/classes/innerClass.kt

@@ -0,0 +1,19 @@
+class Outer(val foo: StringBuilder) {
+  inner class Inner() {
+    fun len() : Int {
+      return foo.length
+    }
+  }
+
+  fun test() : Inner {
+    return Inner()
+  }
+}
+
+fun box() : String {
+  val sb = StringBuilder("xyzzy")
+  val o = Outer(sb)
+  val i = o.test()
+  val l = i.len()
+  return if (l != 5) "fail" else "OK"
+}