[turbofan] Introduce JSCallForwardVarargs operator.

src/compiler/js-typed-lowering.h

 // Copyright 2014 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.
 
 #ifndef V8_COMPILER_JS_TYPED_LOWERING_H_
 #define V8_COMPILER_JS_TYPED_LOWERING_H_
 
 #include "src/base/compiler-specific.h"
 #include "src/base/flags.h"
 #include "src/compiler/graph-reducer.h"
@@ skipping 53 matching lines @@
   Reduction ReduceJSToInteger(Node* node);
   Reduction ReduceJSToLength(Node* node);
   Reduction ReduceJSToName(Node* node);
   Reduction ReduceJSToNumberInput(Node* input);
   Reduction ReduceJSToNumber(Node* node);
   Reduction ReduceJSToStringInput(Node* input);
   Reduction ReduceJSToString(Node* node);
   Reduction ReduceJSToObject(Node* node);
   Reduction ReduceJSConvertReceiver(Node* node);
   Reduction ReduceJSCallConstruct(Node* node);
+  Reduction ReduceJSCallForwardVarargs(Node* node);
   Reduction ReduceJSCallFunction(Node* node);
   Reduction ReduceJSForInNext(Node* node);
   Reduction ReduceJSLoadMessage(Node* node);
   Reduction ReduceJSStoreMessage(Node* node);
   Reduction ReduceJSGeneratorStore(Node* node);
   Reduction ReduceJSGeneratorRestoreContinuation(Node* node);
   Reduction ReduceJSGeneratorRestoreRegister(Node* node);
   Reduction ReduceJSTypeOf(Node* node);
   Reduction ReduceNumberBinop(Node* node);
   Reduction ReduceInt32Binop(Node* node);
@@ skipping 17 matching lines @@
   TypeCache const& type_cache_;
 };
 
 DEFINE_OPERATORS_FOR_FLAGS(JSTypedLowering::Flags)
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_JS_TYPED_LOWERING_H_