[es6] Fix invalid ToString in implementation of ToName.

src/objects.cc

 // Copyright 2013 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.
 
 #include "src/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <sstream>
 
@@ skipping 76 matching lines @@
         JSFunction::cast(native_context->get(constructor_function_index)),
         isolate);
   }
   Handle<JSObject> result = isolate->factory()->NewJSObject(constructor);
   Handle<JSValue>::cast(result)->set_value(*object);
   return result;
 }
 
 
 // static
+MaybeHandle<Name> Object::ToName(Isolate* isolate, Handle<Object> input) {
+  ASSIGN_RETURN_ON_EXCEPTION(
+      isolate, input, Object::ToPrimitive(input, ToPrimitiveHint::kString),
+      Name);
+  if (input->IsName()) return Handle<Name>::cast(input);
+  return ToString(isolate, input);
+}
+
+
+// static
 MaybeHandle<Object> Object::ToNumber(Handle<Object> input) {
   while (true) {
     if (input->IsNumber()) {
       return input;
     }
     if (input->IsString()) {
       return String::ToNumber(Handle<String>::cast(input));
     }
     if (input->IsOddball()) {
       return Oddball::ToNumber(Handle<Oddball>::cast(input));
@@ skipping 16638 matching lines @@
   if (cell->value() != *new_value) {
     cell->set_value(*new_value);
     Isolate* isolate = cell->GetIsolate();
     cell->dependent_code()->DeoptimizeDependentCodeGroup(
         isolate, DependentCode::kPropertyCellChangedGroup);
   }
 }
 
 }  // namespace internal
 }  // namespace v8