Adding a regression test for the incorrect unwrapping of OptionalChainNode.

Author: iamstolis

graal-js/src/com.oracle.truffle.js.test/js/GR-24939.js

@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2020, 2020, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Licensed under the Universal Permissive License v 1.0 as shown at http://oss.oracle.com/licenses/upl.
+ */
+
+load('assert.js');
+
+var argumentsEvaluated = false;
+var f = function () {
+    argumentsEvaluated = true;
+};
+assertThrows(function () {
+    (undefined?.foo)(f());
+}, TypeError);
+assertSame(true, argumentsEvaluated);
+
+true;