[regexp] Fix smi receiver in stack accessors

test/mjsunit/regress/regress-693500.js

Index: test/mjsunit/regress/regress-693500.js
diff --git a/test/mjsunit/regress/regress-693500.js b/test/mjsunit/regress/regress-693500.js
new file mode 100644
index 0000000000000000000000000000000000000000..89b80882b25f51bf38044bdcc432f3901f551812
--- /dev/null
+++ b/test/mjsunit/regress/regress-693500.js
@@ -0,0 +1,5 @@
+// Copyright 2017 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.
+
+Reflect.get(new Error(), "stack", 0);