Subzero. Moves code around in preparations for 64-bit lowering.

src/IceTargetLoweringX8664.h

Index: src/IceTargetLoweringX8664.h
diff --git a/src/IceTargetLoweringX8664.h b/src/IceTargetLoweringX8664.h
index 1e012b5cf157150fc31926f21fa6013a1ef4cfed..b26db5962a27f8d3ecdd330ce95756c94b9b2d3b 100644
--- a/src/IceTargetLoweringX8664.h
+++ b/src/IceTargetLoweringX8664.h
@@ -40,6 +40,10 @@ public:
 
 protected:
   void lowerCall(const InstCall *Instr) override;
+  void lowerArguments() override;
+  void lowerRet(const InstRet *Inst) override;
+  void addProlog(CfgNode *Node) override;
+  void addEpilog(CfgNode *Node) override;
 
 private:
   friend class ::Ice::X86Internal::TargetX86Base<TargetX8664>;