Optimize ToString and NonStringToString.

test/mjsunit/messages.js

Index: test/mjsunit/messages.js
diff --git a/test/mjsunit/messages.js b/test/mjsunit/messages.js
index 2eda002d7c7f42c559d1a649a15e7c9d50b219d8..45443c75d15752fd99640dd7dc51a5cd775d3814 100644
--- a/test/mjsunit/messages.js
+++ b/test/mjsunit/messages.js
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --stack-size=100 --harmony --harmony-reflect --harmony-arrays
-// Flags: --harmony-regexps --harmony-simd --strong-mode
+// Flags: --stack-size=100 --harmony --harmony-reflect --harmony-regexps
+// Flags: --harmony-simd --strong-mode
 
 function test(f, expected, type) {
   try {
@@ -308,11 +308,6 @@ test(function() {
   "a" + 1;
 }, "In strong mode, implicit conversions are deprecated", TypeError);
 
-// kSymbolToPrimitive
-test(function() {
-  1 + Object(Symbol());
-}, "Cannot convert a Symbol wrapper object to a primitive value", TypeError);
-
 // kSymbolToString
 test(function() {
   "" + Symbol();