[llvm] [X86] Fix potential CSE issues in commuteSelect multi-use path (PR #214092)

[Timur Golubovich via llvm-commits]

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@@ -48594,11 +48594,14 @@ static SDValue commuteSelect(SDNode *N, SelectionDAG &DAG, const SDLoc &DL,
     return DAG.getSelect(DL, LHS.getValueType(), NewCond, RHS, LHS);
 
   // Invert the setcc for all users and commute all vselects.
+  SmallVector<SDNode *> UsersToUpdate(Cond->users());
   DAG.ReplaceAllUsesOfValueWith(Cond, NewCond);
-  for (SDNode *User : NewCond->users()) {
+  for (SDNode *User : UsersToUpdate) {
     SDValue UserLHS = User->getOperand(1);
     SDValue UserRHS = User->getOperand(2);
-    DAG.UpdateNodeOperands(User, NewCond, UserRHS, UserLHS);
+    [[maybe_unused]] SDNode *Updated =
+        DAG.UpdateNodeOperands(User, NewCond, UserRHS, UserLHS);
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timurgol007 wrote:

@phoebewang, no, we don't need it. Thank you, this is a good catch

https://github.com/llvm/llvm-project/pull/214092