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/reflection/kClassInAnnotation/checkcast.kt

@@ -0,0 +1,15 @@
+// TODO: muted automatically, investigate should it be ran for JS or not
+// IGNORE_BACKEND: JS
+
+// WITH_REFLECT
+
+import kotlin.reflect.KClass
+
+fun box(): String {
+    try {
+        String::class.java as KClass<String>
+    } catch (e: Exception) {
+        return "OK"
+    }
+    return "fail"
+}