[llvm] [LV] Prevent query the computeCost() when VF=1 in emitInvalidCostRemarks(). (PR #117288)

[David Sherwood via llvm-commits]

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@@ -4499,6 +4499,12 @@ void LoopVectorizationPlanner::emitInvalidCostRemarks(
   SmallVector<RecipeVFPair> InvalidCosts;
   for (const auto &Plan : VPlans) {
     for (ElementCount VF : Plan->vectorFactors()) {
+      // The VPlan-based cost model is designed for computing vector cost.
+      // Quering VPlan-based cost model with scarlar VF will cause some error
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david-arm wrote:

nit: `// Querying VPlan-based cost model with a scalar VF will cause some errors`


https://github.com/llvm/llvm-project/pull/117288