Parser: Fix crash on stack overflow when lazy-parsing arrow functions

test/mjsunit/regress/regress-crbug-465671-null.js

Index: test/mjsunit/regress/regress-crbug-465671-null.js
diff --git a/test/mjsunit/compiler/regress-451012.js b/test/mjsunit/regress/regress-crbug-465671-null.js
similarity index 52%
copy from test/mjsunit/compiler/regress-451012.js
copy to test/mjsunit/regress/regress-crbug-465671-null.js
index bffc8bc5bdfac32bb561a24153d00157b26ac3a5..d24599c38526aca26943669a1b5e153ee652bd9a 100644
--- a/test/mjsunit/compiler/regress-451012.js
+++ b/test/mjsunit/regress/regress-crbug-465671-null.js
@@ -2,11 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-"use strict";
+// Flags: --harmony-arrow-functions
+
+// This used to trigger a segfault because of NULL being accessed.
 function f() {
-  for (let v; v; ) {
-    let x;
+  var a = [10];
+  try {
+    f();
+  } catch(e) {
+    a.map((v) => v + 1);
   }
 }
-
 f();