backend/tests: Add blackbox tests from Kotlin JVM

Added tests from testData/codegen/box directory. There are blackbox tests
in other directories and they are to be added.

backend.native/tests/external/codegen/blackbox/super/basicmethodSuperClass.kt

@@ -0,0 +1,15 @@
+class N() : ArrayList<Any>() {
+    override fun add(el: Any)  : Boolean {
+        if (!super<ArrayList>.add(el)) {
+            throw Exception()
+        }
+        return false
+    }
+}
+
+fun box(): String {
+    val n = N()
+    if (n.add("239")) return "fail"
+    if (n.get(0) == "239") return "OK";
+    return "fail";
+}