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/javaClass.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.assertEquals
+
+inline fun<reified T : Any> javaClassName(): String {
+    return T::class.java.getName()
+}
+
+fun box(): String {
+    assertEquals("java.lang.String", javaClassName<String>())
+    assertEquals("java.lang.Integer", javaClassName<Int>())
+    assertEquals("java.lang.Object", javaClassName<Any>())
+    return "OK"
+}