Fix VC++ level 4 warnings. Because a base class has declared these private, VC++ complains it cannot automatically generate this methods.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24751 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Constant.h

@@ -19,6 +19,8 @@
 namespace llvm {
 
 class Constant : public User {
+  void operator=(const Constant &);     // Do not implement
+  Constant(const Constant &);           // Do not implement
 protected:
   Constant(const Type *Ty, ValueTy vty, Use *Ops, unsigned NumOps,
            const std::string& Name = "")

include/llvm/GlobalVariable.h

@@ -34,6 +34,9 @@ template<typename ValueSubClass, typename ItemParentClass, typename SymTabClass,
 class GlobalVariable : public GlobalValue {
   friend class SymbolTableListTraits<GlobalVariable, Module, Module,
                                      ilist_traits<GlobalVariable> >;
+  void operator=(const GlobalVariable &);     // Do not implement
+  GlobalVariable(const GlobalVariable &);     // Do not implement
+
   void setParent(Module *parent);
 
   GlobalVariable *Prev, *Next;

include/llvm/Instruction.h

@@ -27,6 +27,9 @@ template<typename ValueSubClass, typename ItemParentClass, typename SymTabClass,
          typename SubClass> class SymbolTableListTraits;
 
 class Instruction : public User {
+  void operator=(const Instruction &);     // Do not implement
+  Instruction(const Instruction &);        // Do not implement
+
   BasicBlock *Parent;
   Instruction *Prev, *Next; // Next and Prev links for our intrusive linked list