Allow a client to clear an IntrustiveRefCntPtr (deliberately leaking the referenced object).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128007 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/ADT/IntrusiveRefCntPtr.h

@@ -155,6 +155,10 @@ namespace llvm {
       other.Obj = Obj;
       Obj = tmp;
     }
+    
+    void resetWithoutRelease() {
+      Obj = 0;
+    }
 
   private:
     void retain() { if (Obj) Obj->Retain(); }