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/classes/classSimpleName.kt

@@ -0,0 +1,17 @@
+// TODO: muted automatically, investigate should it be ran for JS or not
+// IGNORE_BACKEND: JS
+
+// WITH_REFLECT
+
+import kotlin.test.assertEquals
+
+class Klass
+
+fun box(): String {
+    assertEquals("Klass", Klass::class.simpleName)
+    assertEquals("Date", java.util.Date::class.simpleName)
+    assertEquals("ObjectRef", kotlin.jvm.internal.Ref.ObjectRef::class.simpleName)
+    assertEquals("Void", java.lang.Void::class.simpleName)
+
+    return "OK"
+}