[turbofan] add initial move optimizer

src/compiler/move-optimizer.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_MOVE_OPTIMIZER_
+#define V8_COMPILER_MOVE_OPTIMIZER_
+
+#include "src/compiler/instruction.h"
+#include "src/zone-containers.h"
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+class MoveOptimizer FINAL {
+ public:
+  MoveOptimizer(Zone* local_zone, InstructionSequence* code);
+  void Run();
+
+ private:
+  typedef ZoneVector<MoveOperands*> MoveOpVector;
+
+  InstructionSequence* code() const { return code_; }
+  Zone* local_zone() const { return local_zone_; }
+  Zone* code_zone() const { return code()->zone(); }
+
+  void CompressMoves(MoveOpVector* eliminated, ParallelMove* left,
+                     ParallelMove* right);
+  void FinalizeMoves(MoveOpVector* loads, MoveOpVector* new_moves,
+                     GapInstruction* gap);
+
+  Zone* const local_zone_;
+  InstructionSequence* const code_;
+  MoveOpVector temp_vector_0_;
+  MoveOpVector temp_vector_1_;
+
+  DISALLOW_COPY_AND_ASSIGN(MoveOptimizer);
+};
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_COMPILER_MOVE_OPTIMIZER_