[turbofan] Introduce JSCallForwardVarargs operator.

src/compiler/code-generator.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/compiler/code-generator.h"
 
 #include "src/address-map.h"
 #include "src/base/adapters.h"
 #include "src/compilation-info.h"
 #include "src/compiler/code-generator-impl.h"
@@ skipping 685 matching lines @@
   // Note:
   // If translation is null, we just skip the relevant instruction operands.
   if (desc->IsNested()) {
     if (translation != nullptr) {
       translation->BeginCapturedObject(static_cast<int>(nested->size()));
     }
     for (auto field : *nested) {
       TranslateStateValueDescriptor(field.desc, field.nested, translation,
                                     iter);
     }
+  } else if (desc->IsArguments()) {
+    if (translation != nullptr) {
+      translation->BeginArgumentsObject(0);
+    }
   } else if (desc->IsDuplicate()) {
     if (translation != nullptr) {
       translation->DuplicateObject(static_cast<int>(desc->id()));
     }
   } else if (desc->IsPlain()) {
     InstructionOperand* op = iter->Advance();
     if (translation != nullptr) {
       AddTranslationForOperand(translation, iter->instruction(), op,
                                desc->type());
     }
@@ skipping 289 matching lines @@
     : frame_(gen->frame()), masm_(gen->masm()), next_(gen->ools_) {
   gen->ools_ = this;
 }
 
 
 OutOfLineCode::~OutOfLineCode() {}
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8