Ensure arrow functions can close over lexically-scoped variables

test/mjsunit/regress/regress-crbug-580934.js

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
-// Flags: --allow-natives-syntax --no-lazy
-// Flags: --harmony-destructuring-bind
+// Flags: --min-preparse-length=0
 
 "use strict";
-eval();
-var f = ({x}) => { };
-%OptimizeFunctionOnNextCall(f);
-assertThrows(f);
+{
+  let one = () => {
+    return "example.com";
+  };
+
+  let two = () => {
+    return one();
+  };
+
+  assertEquals("example.com", two());
+}