Avoid calling overwritten toString methods for internal error

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
index 3bab67e6b24770549acc6d48bc21d0b6540a2731..de00fbba4635a2543775d74ba5e3efa5d8367a43 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -2379,6 +2379,10 @@ TEST(APIThrowMessageOverwrittenToString) {
   CompileRun("ReferenceError.prototype.toString ="
              "  function() { return 'Whoops' }");
   CompileRun("asdf;");
+  CompileRun("ReferenceError.prototype.constructor.name = void 0;");
+  CompileRun("asdf;");
+  CompileRun("ReferenceError.prototype.constructor = void 0;");
+  CompileRun("asdf;");
   v8::Handle<Value> string = CompileRun("try { asdf; } catch(e) { e + ''; }");
   CHECK(string->Equals(v8_str("Whoops")));
   v8::V8::RemoveMessageListeners(check_message);