Skip stack trace formatting in case the global object is already dead.

test/mjsunit/stack-traces-overflow.js

Index: test/mjsunit/stack-traces-overflow.js
diff --git a/test/mjsunit/stack-traces-overflow.js b/test/mjsunit/stack-traces-overflow.js
index 7722e93bd26129f91c2dae44b8294fbb76806c19..b44bfcd8ae6defcf832202bc00cf432acd7b6071 100644
--- a/test/mjsunit/stack-traces-overflow.js
+++ b/test/mjsunit/stack-traces-overflow.js
@@ -57,6 +57,13 @@ try {
 }
 
 
+function assertStackAccessors(error_object, type) {
+  assertSame(type,
+             typeof Object.getOwnPropertyDescriptor(error_object, "stack").get);
+  assertSame(type,
+             typeof Object.getOwnPropertyDescriptor(error_object, "stack").set);
+}
+
 // Check setting/getting stack property on the prototype chain.
 function testErrorPrototype(prototype) {
   var object = {};
@@ -64,6 +71,11 @@ function testErrorPrototype(prototype) {
   object.stack = "123";
   assertEquals("123", object.stack);
   assertTrue("123" != prototype.stack);
+  // Check that the accessors on the prototype error object are untouched.
+  assertStackAccessors(prototype, "function");
+  assertEquals("123", Object.getOwnPropertyDescriptor(object, "stack").value);
+  prototype.stack = "abc";
+  assertStackAccessors(prototype, "undefined");
 }
 
 try {