Subzero: Refactor x86 register definitions to use the alias mechanism.

src/IceCfgNode.h

 //===- subzero/src/IceCfgNode.h - Control flow graph node -------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 13 matching lines @@
 class CfgNode {
   CfgNode() = delete;
   CfgNode(const CfgNode &) = delete;
   CfgNode &operator=(const CfgNode &) = delete;
 
 public:
   static CfgNode *create(Cfg *Func, SizeT LabelIndex) {
     return new (Func->allocate<CfgNode>()) CfgNode(Func, LabelIndex);
   }
 
+  Cfg *getCfg() const { return Func; }
+
   /// Access the label number and name for this node.
   SizeT getIndex() const { return Number; }
   void resetIndex(SizeT NewNumber) { Number = NewNumber; }
   IceString getName() const;
   void setName(const IceString &NewName) {
     // Make sure that the name can only be set once.
     assert(NameIndex == Cfg::IdentifierIndexInvalid);
     if (!NewName.empty())
       NameIndex = Func->addIdentifierName(NewName);
   }
@@ skipping 79 matching lines @@
   InstNumberT InstCountEstimate = 0; /// rough instruction count estimate
   NodeList InEdges;                  /// in no particular order
   NodeList OutEdges;                 /// in no particular order
   PhiList Phis;                      /// unordered set of phi instructions
   InstList Insts;                    /// ordered list of non-phi instructions
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICECFGNODE_H