[runtime] Optimize and unify rest parameters.

src/interface-descriptors.cc

 // Copyright 2012 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/interface-descriptors.h"
 
 namespace v8 {
 namespace internal {
 
 namespace {
@@ skipping 347 matching lines @@
   return function;
 }
 
 
 void ArgumentsAccessNewDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {function(), parameter_count(), parameter_pointer()};
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
-FunctionType*
-RestParamAccessDescriptor::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, SmiType(zone));
-  function->InitParameter(1, ExternalPointer(zone));
-  function->InitParameter(2, SmiType(zone));
-  return function;
-}
-
-
-void RestParamAccessDescriptor::InitializePlatformSpecific(
-    CallInterfaceDescriptorData* data) {
-  Register registers[] = {parameter_count(), parameter_pointer(),
-                          rest_parameter_index()};
-  data->InitializePlatformSpecific(arraysize(registers), registers);
-}
-
 
 void ContextOnlyDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   data->InitializePlatformSpecific(0, nullptr);
 }
 
 
 void GrowArrayElementsDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {ObjectRegister(), KeyRegister()};
@@ skipping 163 matching lines @@
   function->InitParameter(0, AnyTagged(zone));        // callee
   function->InitParameter(1, AnyTagged(zone));        // call_data
   function->InitParameter(2, AnyTagged(zone));        // holder
   function->InitParameter(3, ExternalPointer(zone));  // api_function_address
   return function;
 }
 
 
 }  // namespace internal
 }  // namespace v8