Minor, add test for obsolete issue

#KT-4228 Obsolete

compiler/testData/codegen/box/extensionFunctions/kt4228.kt

@@ -0,0 +1,14 @@
+class A {
+    class object
+}
+
+val foo: Any.() -> Unit = {}
+
+fun test() {
+    A.(foo)()
+}
+
+fun box(): String {
+    test()
+    return "OK"
+}

compiler/tests/org/jetbrains/jet/codegen/generated/BlackBoxCodegenTestGenerated.java

@@ -3215,6 +3215,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             doTest(fileName);
         }
 
+        @TestMetadata("kt4228.kt")
+        public void testKt4228() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/box/extensionFunctions/kt4228.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("kt475.kt")
         public void testKt475() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/box/extensionFunctions/kt475.kt");