[turbofan] add initial move optimizer

src/compiler/instruction.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_INSTRUCTION_H_
 #define V8_COMPILER_INSTRUCTION_H_
 
 #include <deque>
 #include <iosfwd>
 #include <map>
@@ skipping 598 matching lines @@
   ParallelMove* GetParallelMove(InnerPosition pos) {
     return parallel_moves_[pos];
   }
 
   const ParallelMove* GetParallelMove(InnerPosition pos) const {
     return parallel_moves_[pos];
   }
 
   bool IsRedundant() const;
 
+  ParallelMove** parallel_moves() { return parallel_moves_; }
+
   static GapInstruction* New(Zone* zone) {
     void* buffer = zone->New(sizeof(GapInstruction));
     return new (buffer) GapInstruction(kGapInstruction);
   }
 
   static GapInstruction* cast(Instruction* instr) {
     DCHECK(instr->IsGapMoves());
     return static_cast<GapInstruction*>(instr);
   }
 
@@ skipping 461 matching lines @@
 
 
 std::ostream& operator<<(std::ostream& os,
                          const PrintableInstructionSequence& code);
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INSTRUCTION_H_