================
@@ -28,13 +28,13 @@
 namespace llvm {
 
 class UnreachableBlockElimPass
-    : public OptionalPassInfoMixin<UnreachableBlockElimPass> {
+    : public RequiredPassInfoMixin<UnreachableBlockElimPass> {
 public:
   LLVM_ABI PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
 };
 
 class UnreachableMachineBlockElimPass
-    : public OptionalPassInfoMixin<UnreachableMachineBlockElimPass> {
+    : public RequiredPassInfoMixin<UnreachableMachineBlockElimPass> {
----------------
krzysz00 wrote:

Drive-by question: why's this a required pass? It sounds like an optimization?

https://github.com/llvm/llvm-project/pull/203511
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