Index: llvm/lib/Transforms/Utils/LoopUtils.cpp
===================================================================
--- llvm/lib/Transforms/Utils/LoopUtils.cpp
+++ llvm/lib/Transforms/Utils/LoopUtils.cpp
@@ -598,7 +598,7 @@
   }
 
   // Use a map to unique and a vector to guarantee deterministic ordering.
-  llvm::SmallDenseSet<std::pair<DIVariable *, DIExpression *>, 4> DeadDebugSet;
+  llvm::SmallDenseSet<DebugVariable, 4> DeadDebugSet;
   llvm::SmallVector<DbgVariableIntrinsic *, 4> DeadDebugInst;
 
   if (ExitBlock) {
@@ -627,11 +627,8 @@
         auto *DVI = dyn_cast<DbgVariableIntrinsic>(&I);
         if (!DVI)
           continue;
-        auto Key =
-            DeadDebugSet.find({DVI->getVariable(), DVI->getExpression()});
-        if (Key != DeadDebugSet.end())
+        if (!DeadDebugSet.insert(DebugVariable(DVI)).second)
           continue;
-        DeadDebugSet.insert({DVI->getVariable(), DVI->getExpression()});
         DeadDebugInst.push_back(DVI);
       }