Extend JSBuiltinReducer to cover Math.max as well.

src/compiler/js-builtin-reducer.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_BUILTIN_REDUCER_H_
 #define V8_COMPILER_JS_BUILTIN_REDUCER_H_
 
 #include "src/compiler/graph-reducer.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/machine-operator.h"
 #include "src/compiler/node.h"
 #include "src/compiler/simplified-operator.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 class JSBuiltinReducer FINAL : public Reducer {
  public:
   explicit JSBuiltinReducer(JSGraph* jsgraph)
       : jsgraph_(jsgraph), simplified_(jsgraph->zone()) {}
   virtual ~JSBuiltinReducer() {}
 
   virtual Reduction Reduce(Node* node) OVERRIDE;
 
  private:
-  Graph* graph() { return jsgraph_->graph(); }
-  CommonOperatorBuilder* common() { return jsgraph_->common(); }
-  MachineOperatorBuilder* machine() { return jsgraph_->machine(); }
+  JSGraph* jsgraph() const { return jsgraph_; }
+  Graph* graph() const { return jsgraph_->graph(); }
+  CommonOperatorBuilder* common() const { return jsgraph_->common(); }
+  MachineOperatorBuilder* machine() const { return jsgraph_->machine(); }
   SimplifiedOperatorBuilder* simplified() { return &simplified_; }
 
+  Reduction ReduceMathMax(Node* node);
   Reduction ReduceMathImul(Node* node);
 
   JSGraph* jsgraph_;
   SimplifiedOperatorBuilder simplified_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_JS_BUILTIN_REDUCER_H_