[es6] Function.prototype.name should be the empty string

src/bootstrapper.cc

 // Copyright 2014 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/bootstrapper.h"
 
 #include "src/accessors.h"
 #include "src/api-natives.h"
 #include "src/base/utils/random-number-generator.h"
 #include "src/code-stubs.h"
@@ skipping 483 matching lines @@
 
     native_context()->set_initial_object_prototype(*object_function_prototype);
     // For bootstrapping set the array prototype to be the same as the object
     // prototype, otherwise the missing initial_array_prototype will cause
     // assertions during startup.
     native_context()->set_initial_array_prototype(*object_function_prototype);
     Accessors::FunctionSetPrototype(object_fun, object_function_prototype)
         .Assert();
   }
 
-  // Allocate the empty function as the prototype for function ECMAScript
-  // 262 15.3.4.
-  Handle<String> empty_string =
-      factory->InternalizeOneByteString(STATIC_CHAR_VECTOR("Empty"));
+  // Allocate the empty function as the prototype for function - ES6 19.2.3
   Handle<Code> code(isolate->builtins()->builtin(Builtins::kEmptyFunction));
-  Handle<JSFunction> empty_function = factory->NewFunctionWithoutPrototype(
-      empty_string, code);
+  Handle<JSFunction> empty_function =
+      factory->NewFunctionWithoutPrototype(factory->empty_string(), code);
 
   // Allocate the function map first and then patch the prototype later
   Handle<Map> empty_function_map =
       CreateSloppyFunctionMap(FUNCTION_WITHOUT_PROTOTYPE);
   DCHECK(!empty_function_map->is_dictionary_map());
   Map::SetPrototype(empty_function_map, object_function_prototype);
   empty_function_map->set_is_prototype_map(true);
 
   empty_function->set_map(*empty_function_map);
 
@@ skipping 2439 matching lines @@
   return from + sizeof(NestingCounterType);
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 } }  // namespace v8::internal