Subzero: Improve class definition hygiene.

src/IceLiveness.h

 //===- subzero/src/IceLiveness.h - Liveness analysis ------------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares the Liveness and LivenessNode classes,
 // which are used for liveness analysis.  The node-specific
 // information tracked for each Variable includes whether it is
 // live on entry, whether it is live on exit, the instruction number
 // that starts its live range, and the instruction number that ends
 // its live range.  At the Cfg level, the actual live intervals are
 // recorded.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICELIVENESS_H
 #define SUBZERO_SRC_ICELIVENESS_H
 
 #include "IceDefs.h"
 #include "IceTypes.h"
 
 namespace Ice {
 
 class Liveness {
+  Liveness() = delete;
   Liveness(const Liveness &) = delete;
   Liveness &operator=(const Liveness &) = delete;
 
   class LivenessNode {
     LivenessNode &operator=(const LivenessNode &) = delete;
 
   public:
     LivenessNode() : NumLocals(0), NumNonDeadPhis(0) {}
     LivenessNode(const LivenessNode &) = default;
     // NumLocals is the number of Variables local to this block.
@@ skipping 69 matching lines @@
   // within its basic block.
   std::vector<SizeT> VarToLiveMap;
   // LiveToVarMap is analogous to LivenessNode::LiveToVarMap, but for
   // non-local variables.
   std::vector<Variable *> LiveToVarMap;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICELIVENESS_H