[turbofan] Redundant load elimination.

src/compiler/load-elimination.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_LOAD_ELIMINATION_H_
+#define V8_COMPILER_LOAD_ELIMINATION_H_
+
+#include "src/compiler/graph-reducer.h"
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+class LoadElimination FINAL : public Reducer {
+ public:
+  LoadElimination() {}
+  ~LoadElimination() FINAL;
+
+  Reduction Reduce(Node* node) FINAL;
+
+ private:
+  Reduction ReduceLoadField(Node* node);
+};
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_COMPILER_LOAD_ELIMINATION_H_