- ConstantPointerRefs are now automatically removed from the module table

when they are destroyed, which makes Constant::destroyConstant an actually
    useful external interface.  Expose these methods publicly.
  - Implement destroyConstant on ConstPointerNull so that destroyConstant can
    be used on any derived type constant safely.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3378 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Module.h

@@ -63,6 +63,7 @@ private:
   friend class ConstantPointerRef;
   void mutateConstantPointerRef(GlobalValue *OldGV, GlobalValue *NewGV);
   ConstantPointerRef *getConstantPointerRef(GlobalValue *GV);
+  void destroyConstantPointerRef(ConstantPointerRef *CPR);
 
 public:
   Module();