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/factorialTest.kt

@@ -0,0 +1,44 @@
+// WITH_RUNTIME
+
+import kotlin.test.assertEquals
+
+fun facWhile(i: Int): Int {
+    var count = 1;
+    var result = 1;
+    while(count < i) {
+        count = count + 1;
+        result = result * count;
+    }
+    return result;
+}
+
+fun facBreak(i: Int): Int {
+    var count = 1;
+    var result = 1;
+    while(true) {
+        count = count + 1;
+        result = result * count;
+        if (count == i) break;
+    }
+    return result;
+}
+
+fun facDoWhile(i: Int): Int {
+    var count = 1;
+    var result = 1;
+    do {
+        count = count + 1;
+        result = result * count;
+    } while(count != i);
+    return result;
+}
+
+fun box(): String {
+    assertEquals(6, facWhile(3))
+    assertEquals(6, facBreak(3))
+    assertEquals(6, facDoWhile(3))
+    assertEquals(120, facWhile(5))
+    assertEquals(120, facBreak(5))
+    assertEquals(120, facDoWhile(5))
+    return "OK"
+}