tests: Update external tests (1.1.2-dev-393)

backend.native/tests/external/codegen/box/increment/prefixNullableClassIncrement.kt

@@ -0,0 +1,11 @@
+class MyClass
+
+operator fun MyClass?.inc(): MyClass? = null
+
+public fun box() : String {
+    var i : MyClass? 
+    i = MyClass()
+    val j = ++i
+
+    return if (j == null && null == i) "OK" else "fail i = $i j = $j"
+}