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/arrays/arrayInstanceOf.kt

@@ -0,0 +1,29 @@
+// TODO: muted automatically, investigate should it be ran for JS or not
+// IGNORE_BACKEND: JS
+
+//test [], get and iterator calls
+fun test(createIntNotLong: Boolean): String {
+    val a = if (createIntNotLong) IntArray(5) else LongArray(5)
+    if (a is IntArray) {
+        val x = a.iterator()
+        var i = 0
+        while (x.hasNext()) {
+            if (a[i] != x.next()) return "Fail $i"
+            i++
+        }
+        return "O"
+    } else if (a is LongArray) {
+        val x = a.iterator()
+        var i = 0
+        while (x.hasNext()) {
+            if (a.get(i) != x.next()) return "Fail $i"
+            i++
+        }
+        return "K"
+    }
+    return "fail"
+}
+
+fun box(): String {
+    return test(true) + test(false)
+}