[es6] Parameter scopes for sloppy eval

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 <iomanip>
 #include <sstream>
 
 #include "src/accessors.h"
@@ skipping 5346 matching lines @@
             return true;
           }
         } else if (ctxobj == obj) {
           return true;
         }
       }
     }
 
     // Check the context extension (if any) if it can have references.
     if (context->has_extension() && !context->IsCatchContext()) {
-      // With harmony scoping, a JSFunction may have a global context.
+      // With harmony scoping, a JSFunction may have a script context.
       // TODO(mvstanton): walk into the ScopeInfo.
       if (context->IsScriptContext()) {
         return false;
       }
 
-      return JSObject::cast(context->extension())->ReferencesObject(obj);
+      return context->extension_object()->ReferencesObject(obj);
     }
   }
 
   // No references to object.
   return false;
 }
 
 
 MaybeHandle<Object> JSObject::PreventExtensions(Handle<JSObject> object) {
   if (!object->map()->is_extensible()) return object;
@@ skipping 10316 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