Add JSBuiltinReducer for inlining well-known builtins.

src/compiler/js-builtin-reducer.h

Index: src/compiler/js-builtin-reducer.h
diff --git a/src/compiler/js-builtin-reducer.h b/src/compiler/js-builtin-reducer.h
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+++ b/src/compiler/js-builtin-reducer.h
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+// 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(); }
+  SimplifiedOperatorBuilder* simplified() { return &simplified_; }
+
+  Reduction ReduceMathImul(Node* node);
+
+  JSGraph* jsgraph_;
+  SimplifiedOperatorBuilder simplified_;
+};
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_COMPILER_JS_BUILTIN_REDUCER_H_