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/varargInJava.kt

@@ -0,0 +1,26 @@
+// TODO: muted automatically, investigate should it be ran for JS or not
+// IGNORE_BACKEND: JS
+
+// WITH_RUNTIME
+// FILE: Test.java
+
+class O {}
+class K {}
+
+@Ann(args={O.class, K.class})
+class Test {
+}
+
+// FILE: vararg.kt
+
+import kotlin.reflect.KClass
+
+@Retention(AnnotationRetention.RUNTIME)
+annotation class Ann(vararg val args: KClass<*>)
+
+fun box(): String {
+    val args = Test::class.java.getAnnotation(Ann::class.java).args
+    val argName1 = args[0].java.simpleName ?: "fail 1"
+    val argName2 = args[1].java.simpleName ?: "fail 2"
+    return argName1 + argName2
+}