| Index: src/interface-descriptors.cc | 
| diff --git a/src/interface-descriptors.cc b/src/interface-descriptors.cc | 
| index cc46a56d94a2155103aea7978c216c5b973e8166..844cc3fe950922f8298b19f4fcc98a8becf24570 100644 | 
| --- a/src/interface-descriptors.cc | 
| +++ b/src/interface-descriptors.cc | 
| @@ -339,6 +339,25 @@ | 
| data->InitializePlatformSpecific(arraysize(registers), registers); | 
| } | 
|  | 
| +FunctionType* | 
| +ArgumentsAccessNewDescriptor::BuildCallInterfaceDescriptorFunctionType( | 
| +    Isolate* isolate, int paramater_count) { | 
| +  Zone* zone = isolate->interface_descriptor_zone(); | 
| +  FunctionType* function = | 
| +      Type::Function(AnyTagged(zone), Type::Undefined(), 3, zone)->AsFunction(); | 
| +  function->InitParameter(0, AnyTagged(zone)); | 
| +  function->InitParameter(1, SmiType(zone)); | 
| +  function->InitParameter(2, ExternalPointer(zone)); | 
| +  return function; | 
| +} | 
| + | 
| + | 
| +void ArgumentsAccessNewDescriptor::InitializePlatformSpecific( | 
| +    CallInterfaceDescriptorData* data) { | 
| +  Register registers[] = {function(), parameter_count(), parameter_pointer()}; | 
| +  data->InitializePlatformSpecific(arraysize(registers), registers); | 
| +} | 
| + | 
|  | 
| void ContextOnlyDescriptor::InitializePlatformSpecific( | 
| CallInterfaceDescriptorData* data) { | 
|  |