[llvm] LoopVectorize: guard appending InstsToScalarize; fix bug (PR #88720)

[Ramkumar Ramachandra via llvm-commits]

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@@ -5815,7 +5815,8 @@ void LoopVectorizationCostModel::collectInstsToScalarize(ElementCount VF) {
     if (!blockNeedsPredicationForAnyReason(BB))
       continue;
     for (Instruction &I : *BB)
-      if (isScalarWithPredication(&I, VF)) {
+      if (isScalarWithPredication(&I, VF) &&
+          !isScalarAfterVectorization(&I, VF)) {
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artagnon wrote:

Thanks for catching this think-o! Fixed now.

https://github.com/llvm/llvm-project/pull/88720