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/reified/defaultJavaClass.kt

@@ -0,0 +1,22 @@
+// TODO: muted automatically, investigate should it be ran for JS or not
+// IGNORE_BACKEND: JS
+
+// WITH_RUNTIME
+
+import kotlin.test.assertEquals
+
+inline fun <reified T : Any> foo(x: Class<T> = T::class.java): String = x.getName()
+
+inline fun <reified R : Any> bar(x: R): String = foo<R>()
+
+fun box(): String {
+    assertEquals("java.lang.String", foo<String>())
+    assertEquals("java.lang.Integer", foo<Int>())
+    assertEquals("java.lang.Object", foo<Any>())
+
+    assertEquals("java.lang.String", bar("abc"))
+    assertEquals("java.lang.Integer", bar(1))
+    assertEquals("java.lang.Object", bar(Any()))
+
+    return "OK"
+}