[llvm] [LoopVectorize] In LoopVectorize.cpp start using getSymbolicMaxBackedgeTakenCount (PR #108833)

[Florian Hahn via llvm-commits]

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@@ -907,7 +907,7 @@ Value *getRuntimeVF(IRBuilderBase &B, Type *Ty, ElementCount VF) {
 
 const SCEV *createTripCountSCEV(Type *IdxTy, PredicatedScalarEvolution &PSE,
                                 Loop *OrigLoop) {
-  const SCEV *BackedgeTakenCount = PSE.getBackedgeTakenCount();
+  const SCEV *BackedgeTakenCount = PSE.getSymbolicMaxBackedgeTakenCount();
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fhahn wrote:

I think this would at least need a comment explaining why this is used here, as at the moment this might be very surprising

https://github.com/llvm/llvm-project/pull/108833