[turbofan] Remove some dead code in move optimizer.

src/compiler/move-optimizer.h

Index: src/compiler/move-optimizer.h
diff --git a/src/compiler/move-optimizer.h b/src/compiler/move-optimizer.h
index aee0c78191bf074d97068967817fab1892f9afc6..c9a3289d6b26ab625f6b13bc4525d857358c3082 100644
--- a/src/compiler/move-optimizer.h
+++ b/src/compiler/move-optimizer.h
@@ -24,12 +24,10 @@ class MoveOptimizer final {
   InstructionSequence* code() const { return code_; }
   Zone* local_zone() const { return local_zone_; }
   Zone* code_zone() const { return code()->zone(); }
-  MoveOpVector& temp_vector_0() { return temp_vector_0_; }
-  MoveOpVector& temp_vector_1() { return temp_vector_1_; }
+  MoveOpVector& local_vector() { return local_vector_; }
 
   void CompressBlock(InstructionBlock* blocke);
-  void CompressMoves(MoveOpVector* eliminated, ParallelMove* left,
-                     ParallelMove* right);
+  void CompressMoves(ParallelMove* left, ParallelMove* right);
   const Instruction* LastInstruction(const InstructionBlock* block) const;
   void OptimizeMerge(InstructionBlock* block);
   void FinalizeMoves(Instruction* instr);
@@ -37,8 +35,7 @@ class MoveOptimizer final {
   Zone* const local_zone_;
   InstructionSequence* const code_;
   Instructions to_finalize_;
-  MoveOpVector temp_vector_0_;
-  MoveOpVector temp_vector_1_;
+  MoveOpVector local_vector_;
 
   DISALLOW_COPY_AND_ASSIGN(MoveOptimizer);
 };