[llvm] [LoopVectorize] Use CodeSize as the cost kind for minsize (PR #124119)

[Florian Hahn via llvm-commits]

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@@ -5506,7 +5515,8 @@ InstructionCost LoopVectorizationCostModel::computePredInstDiscount(
       }
 
     // Scale the total scalar cost by block probability.
-    ScalarCost /= getReciprocalPredBlockProb();
+    if (CostKind != TTI::TCK_CodeSize)
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fhahn wrote:

It looks like the checks here and below may not be covered by the existing tests. Would be good to add test coverage for some of them, if possible.

https://github.com/llvm/llvm-project/pull/124119