Index: include/llvm/IR/GlobalVariable.h
===================================================================
--- include/llvm/IR/GlobalVariable.h
+++ include/llvm/IR/GlobalVariable.h
@@ -65,6 +65,8 @@
                  bool isExternallyInitialized = false);
 
   ~GlobalVariable() override {
+    dropAllReferences();
+
     // FIXME: needed by operator delete
     setGlobalVariableNumOperands(1);
   }