[es6] Function length property should be configurable

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/code-stubs.h"
 #include "src/extensions/externalize-string-extension.h"
@@ skipping 370 matching lines @@
     Handle<Map> map, FunctionMode function_mode) {
   int size = IsFunctionModeWithPrototype(function_mode) ? 5 : 4;
   Map::EnsureDescriptorSlack(map, size);
 
   PropertyAttributes ro_attribs =
       static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
   PropertyAttributes roc_attribs =
       static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY);
 
   Handle<AccessorInfo> length =
-      Accessors::FunctionLengthInfo(isolate(), ro_attribs);
+      Accessors::FunctionLengthInfo(isolate(), roc_attribs);
   {  // Add length.
     AccessorConstantDescriptor d(Handle<Name>(Name::cast(length->name())),
-                                 length, ro_attribs);
+                                 length, roc_attribs);
     map->AppendDescriptor(&d);
   }
   Handle<AccessorInfo> name =
       Accessors::FunctionNameInfo(isolate(), ro_attribs);
   {  // Add name.
     AccessorConstantDescriptor d(Handle<Name>(Name::cast(name->name())), name,
                                  roc_attribs);
     map->AppendDescriptor(&d);
   }
   Handle<AccessorInfo> args =
@@ skipping 143 matching lines @@
   // Add length.
   if (function_mode == BOUND_FUNCTION) {
     Handle<String> length_string = isolate()->factory()->length_string();
     DataDescriptor d(length_string, 0, ro_attribs, Representation::Tagged());
     map->AppendDescriptor(&d);
   } else {
     DCHECK(function_mode == FUNCTION_WITH_WRITEABLE_PROTOTYPE ||
            function_mode == FUNCTION_WITH_READONLY_PROTOTYPE ||
            function_mode == FUNCTION_WITHOUT_PROTOTYPE);
     Handle<AccessorInfo> length =
-        Accessors::FunctionLengthInfo(isolate(), ro_attribs);
+        Accessors::FunctionLengthInfo(isolate(), roc_attribs);
     AccessorConstantDescriptor d(Handle<Name>(Name::cast(length->name())),
-                                 length, ro_attribs);
+                                 length, roc_attribs);
     map->AppendDescriptor(&d);
   }
   Handle<AccessorInfo> name =
       Accessors::FunctionNameInfo(isolate(), roc_attribs);
   {  // Add name.
     AccessorConstantDescriptor d(Handle<Name>(Name::cast(name->name())), name,
                                  roc_attribs);
     map->AppendDescriptor(&d);
   }
   {  // Add arguments.
@@ skipping 2351 matching lines @@
   return from + sizeof(NestingCounterType);
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 } }  // namespace v8::internal