[runtime] Optimize and unify rest parameters.

src/compiler/bytecode-graph-builder.cc

 // Copyright 2015 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/bytecode-graph-builder.h"
 
 #include "src/compiler/bytecode-branch-analysis.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/operator-properties.h"
 #include "src/interpreter/bytecodes.h"
@@ skipping 977 matching lines @@
       bytecode_iterator().GetConstantForIndexOperand(0));
   PretenureFlag tenured =
       bytecode_iterator().GetImmediateOperand(1) ? TENURED : NOT_TENURED;
   const Operator* op = javascript()->CreateClosure(shared_info, tenured);
   Node* closure = NewNode(op);
   environment()->BindAccumulator(closure);
 }
 
 void BytecodeGraphBuilder::VisitCreateClosureWide() { VisitCreateClosure(); }
 
-void BytecodeGraphBuilder::BuildCreateArguments(
-    CreateArgumentsParameters::Type type, int rest_index) {
+void BytecodeGraphBuilder::BuildCreateArguments(CreateArgumentsType type) {
   FrameStateBeforeAndAfter states(this);
-  const Operator* op = javascript()->CreateArguments(type, rest_index);
+  const Operator* op = javascript()->CreateArguments(type);
   Node* object = NewNode(op, GetFunctionClosure());
   environment()->BindAccumulator(object, &states);
 }
 
 void BytecodeGraphBuilder::VisitCreateMappedArguments() {
-  BuildCreateArguments(CreateArgumentsParameters::kMappedArguments, 0);
+  BuildCreateArguments(CreateArgumentsType::kMappedArguments);
 }
 
 void BytecodeGraphBuilder::VisitCreateUnmappedArguments() {
-  BuildCreateArguments(CreateArgumentsParameters::kUnmappedArguments, 0);
+  BuildCreateArguments(CreateArgumentsType::kUnmappedArguments);
 }
 
-void BytecodeGraphBuilder::VisitCreateRestArguments() {
-  int index =
-      Smi::cast(*bytecode_iterator().GetConstantForIndexOperand(0))->value();
-  BuildCreateArguments(CreateArgumentsParameters::kRestArray, index);
+void BytecodeGraphBuilder::VisitCreateRestParameter() {
+  BuildCreateArguments(CreateArgumentsType::kRestParameter);
 }
 
 void BytecodeGraphBuilder::BuildCreateLiteral(const Operator* op) {
   FrameStateBeforeAndAfter states(this);
   Node* literal = NewNode(op, GetFunctionClosure());
   environment()->BindAccumulator(literal, &states);
 }
 
 void BytecodeGraphBuilder::BuildCreateRegExpLiteral() {
   Handle<String> constant_pattern =
@@ skipping 807 matching lines @@
     // Phi does not exist yet, introduce one.
     value = NewPhi(inputs, value, control);
     value->ReplaceInput(inputs - 1, other);
   }
   return value;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8