Crankshaft: Move LParallelMove to lithium.h, add LGap to lithium-x64.h.

src/arm/lithium-arm.h

Index: src/arm/lithium-arm.h
===================================================================
--- src/arm/lithium-arm.h	(revision 6222)
+++ src/arm/lithium-arm.h	(working copy)
@@ -332,27 +332,6 @@
 };
 
 
-class LParallelMove : public ZoneObject {
- public:
-  LParallelMove() : move_operands_(4) { }
-
-  void AddMove(LOperand* from, LOperand* to) {
-    move_operands_.Add(LMoveOperands(from, to));
-  }
-
-  bool IsRedundant() const;
-
-  const ZoneList<LMoveOperands>* move_operands() const {
-    return &move_operands_;
-  }
-
-  void PrintDataTo(StringStream* stream) const;
-
- private:
-  ZoneList<LMoveOperands> move_operands_;
-};
-
-
 class LGap: public LInstruction {
  public:
   explicit LGap(HBasicBlock* block)