[llvm] [DAGCombiner] Fix ReplaceAllUsesOfValueWith mutation bug in visitFREEZE (PR #104924)

[Simon Pilgrim via llvm-commits]

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@@ -15808,13 +15808,17 @@ SDValue DAGCombiner::visitFREEZE(SDNode *N) {
     }
   }
 
-  SmallSetVector<SDValue, 8> MaybePoisonOperands;
-  for (SDValue Op : N0->ops()) {
+  SmallSet<SDValue, 8> MaybePoisonOperands;
+  SmallVector<unsigned, 8> MaybePoisonOperandNumbers;
+  for (unsigned OpNo = 0; OpNo < N0->getNumOperands(); ++OpNo) {
+    SDValue Op = N0->getOperand(OpNo);
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RKSimon wrote:

you can use enumerate to get the index / value pair

https://github.com/llvm/llvm-project/pull/104924