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/classLiterals/genericClass.kt

@@ -0,0 +1,11 @@
+// WITH_REFLECT
+
+import kotlin.test.assertEquals
+
+class Generic<K, V>
+
+fun box(): String {
+    val g = Generic::class
+    assertEquals("Generic", g.simpleName)
+    return "OK"
+}