Subzero: Improve class definition hygiene.

src/IceCfg.h

 //===- subzero/src/IceCfg.h - Control flow graph ----------------*- 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 Cfg class, which represents the control flow
 // graph and the overall per-function compilation context.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICECFG_H
 #define SUBZERO_SRC_ICECFG_H
 
 #include "assembler.h"
 #include "IceClFlags.h"
 #include "IceDefs.h"
 #include "IceGlobalContext.h"
 #include "IceTypes.h"
 
 namespace Ice {
 
 class Cfg {
+  Cfg() = delete;
   Cfg(const Cfg &) = delete;
   Cfg &operator=(const Cfg &) = delete;
 
 public:
   ~Cfg();
 
   static std::unique_ptr<Cfg> create(GlobalContext *Ctx,
                                      uint32_t SequenceNumber) {
     return std::unique_ptr<Cfg>(new Cfg(Ctx, SequenceNumber));
   }
@@ skipping 184 matching lines @@
   // other uses are possible.
   ICE_TLS_DECLARE_FIELD(const Cfg *, CurrentCfg);
 
 public:
   static void TlsInit() { ICE_TLS_INIT_FIELD(CurrentCfg); }
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICECFG_H