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/methodsFromAny/classToString.kt

@@ -0,0 +1,33 @@
+// TODO: muted automatically, investigate should it be ran for JS or not
+// IGNORE_BACKEND: JS
+
+// WITH_REFLECT
+
+import kotlin.test.*
+
+class A {
+    class Nested
+
+    companion object
+}
+
+fun box(): String {
+    assertEquals("class A", "${A::class}")
+    assertEquals("class A\$Nested", "${A.Nested::class}")
+    assertEquals("class A\$Companion", "${A.Companion::class}")
+
+    assertEquals("class kotlin.Any", "${Any::class}")
+    assertEquals("class kotlin.Int", "${Int::class}")
+    assertEquals("class kotlin.Int\$Companion", "${Int.Companion::class}")
+    assertEquals("class kotlin.IntArray", "${IntArray::class}")
+    assertEquals("class kotlin.String", "${String::class}")
+    assertEquals("class kotlin.String", "${java.lang.String::class}")
+
+    assertEquals("class kotlin.Array", "${Array<Any>::class}")
+    assertEquals("class kotlin.Array", "${Array<Int>::class}")
+    assertEquals("class kotlin.Array", "${Array<Array<String>>::class}")
+
+    assertEquals("class java.lang.Runnable", "${Runnable::class}")
+
+    return "OK"
+}