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/properties/protectedClassVar.kt

@@ -0,0 +1,34 @@
+// TODO: muted automatically, investigate should it be ran for JS or not
+// IGNORE_BACKEND: JS
+
+// WITH_REFLECT
+
+import kotlin.reflect.*
+import kotlin.reflect.jvm.isAccessible
+
+class A(param: String) {
+    protected var v: String = param
+
+    fun ref() = A::class.memberProperties.single() as KMutableProperty1<A, String>
+}
+
+fun box(): String {
+    val a = A(":(")
+    val f = a.ref()
+
+    try {
+        f.get(a)
+        return "Fail: protected property getter is accessible by default"
+    } catch (e: IllegalCallableAccessException) { }
+
+    try {
+        f.set(a, ":D")
+        return "Fail: protected property setter is accessible by default"
+    } catch (e: IllegalCallableAccessException) { }
+
+    f.isAccessible = true
+
+    f.set(a, ":)")
+
+    return if (f.get(a) != ":)") "Fail: ${f.get(a)}" else "OK"
+}