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/noReflectAtRuntime/simpleClassLiterals.kt

@@ -0,0 +1,17 @@
+// TODO: muted automatically, investigate should it be ran for JS or not
+// IGNORE_BACKEND: JS
+
+// WITH_RUNTIME
+
+import kotlin.test.assertNotNull
+
+class Klass
+
+fun box(): String {
+    assertNotNull(Int::class)
+    assertNotNull(String::class)
+    assertNotNull(Klass::class)
+    assertNotNull(Error::class)
+
+    return "OK"
+}