test: add regression test for instanceof

Ref: #7592.
PR-URL: #7638
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>

test/parallel/test-instanceof.js

@@ -0,0 +1,7 @@
+'use strict';
+require('../common');
+const assert = require('assert');
+
+const F = () => {};
+F.prototype = {};
+assert(Object.create(F.prototype) instanceof F);