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/controlStructures/longRange.kt

@@ -0,0 +1,8 @@
+fun box(): String {
+  val r = 1.toLong()..2
+  var s = ""
+  for (l in r) {
+    s += l
+  }
+  return if (s == "12") "OK" else "fail: $s"
+}