[es6] Parameter scopes for sloppy eval

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 1f25a5d11b7dcd788a6541e41781eb98e826f6b7..548da3946366eb099fb82a7d83fe0f2a29182e94 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -5364,13 +5364,13 @@ bool JSObject::ReferencesObject(Object* obj) {
 
     // 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);
     }
   }