Index: llvm/lib/CodeGen/RDFLiveness.cpp
===================================================================
--- llvm/lib/CodeGen/RDFLiveness.cpp
+++ llvm/lib/CodeGen/RDFLiveness.cpp
@@ -235,7 +235,7 @@
 
   // Sort the blocks with respect to dominance.
   std::sort(TmpBB.begin(), TmpBB.end(), [this](auto A, auto B) {
-    return MDT.dominates(A, B);
+    return MDT.properlyDominates(A, B);
   });
 
   std::vector<NodeId> TmpInst;