[wasm] Handle potentially null callee-pc

test/mjsunit/regress/regress-673241.js

Index: test/mjsunit/regress/regress-673241.js
diff --git a/test/mjsunit/regress/regress-673241.js b/test/mjsunit/regress/regress-673241.js
new file mode 100644
index 0000000000000000000000000000000000000000..a4d6ffe96fcda65d1a4ab0ef718892bda2415329
--- /dev/null
+++ b/test/mjsunit/regress/regress-673241.js
@@ -0,0 +1,13 @@
+// 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: --validate-asm
+
+function generateAsmJs() {
+  'use asm';
+  function fun() { fun(); }
+  return fun;
+}
+
+assertThrows(generateAsmJs());