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/functions/infixRecursiveCall.kt

@@ -0,0 +1,8 @@
+infix fun Int.test(x : Int) : Int {
+    if (this > 1) {
+        return (this - 1) test x
+    }
+    return this
+}
+
+fun box() : String = if (10.test(10) == 1) "OK" else "FAIL"