[turbofan] Introduce JSCallForwardVarargs operator.

src/builtins/builtins-call.cc

Index: src/builtins/builtins-call.cc
diff --git a/src/builtins/builtins-call.cc b/src/builtins/builtins-call.cc
index e3054a99139c3483175a6fb2da758e7f14fb5b18..94078529fac29505bf2de2a84d9722a3fc9742a6 100644
--- a/src/builtins/builtins-call.cc
+++ b/src/builtins/builtins-call.cc
@@ -2,8 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "src/builtins/builtins.h"
 #include "src/builtins/builtins-utils.h"
+#include "src/builtins/builtins.h"
+#include "src/macro-assembler.h"
 
 namespace v8 {
 namespace internal {
@@ -147,5 +148,14 @@ void Builtins::Generate_TailCall_ReceiverIsAny(MacroAssembler* masm) {
   Generate_Call(masm, ConvertReceiverMode::kAny, TailCallMode::kAllow);
 }
 
+void Builtins::Generate_CallForwardVarargs(MacroAssembler* masm) {
+  Generate_CallForwardVarargs(masm, masm->isolate()->builtins()->Call());
+}
+
+void Builtins::Generate_CallFunctionForwardVarargs(MacroAssembler* masm) {
+  Generate_CallForwardVarargs(masm,
+                              masm->isolate()->builtins()->CallFunction());
+}
+
 }  // namespace internal
 }  // namespace v8