[turbofan] Introduce JSCallForwardVarargs operator.

src/compiler/code-generator.cc

Index: src/compiler/code-generator.cc
diff --git a/src/compiler/code-generator.cc b/src/compiler/code-generator.cc
index bf30ec9ab19498f1f59ef16f1f488e965761a0b1..f36cdfc3977bf426b82f6249f91bd8dad5f1da4f 100644
--- a/src/compiler/code-generator.cc
+++ b/src/compiler/code-generator.cc
@@ -703,6 +703,10 @@ void CodeGenerator::TranslateStateValueDescriptor(
       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()));