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

src/lithium.h

Index: src/lithium.h
===================================================================
--- src/lithium.h	(revision 6222)
+++ src/lithium.h	(working copy)
@@ -58,6 +58,27 @@
 };
 
 
+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_;
+};
+
+
 } }  // namespace v8::internal
 
 #endif  // V8_LITHIUM_H_