[llvm] [LoopVectorize] Further improve cost model for early exit loops (PR #126235)

[David Sherwood via llvm-commits]

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@@ -10230,8 +10270,8 @@ static bool areRuntimeChecksProfitable(GeneratedRTChecks &Checks,
   // For now we assume the epilogue cost EpiC = 0 for simplicity. Note that
   // the computations are performed on doubles, not integers and the result
   // is rounded up, hence we get an upper estimate of the TC.
-  unsigned IntVF = getEstimatedRuntimeVF(VF.Width, VScale);
-  uint64_t RtC = *CheckCost.getValue();
+  unsigned IntVF = getEstimatedRuntimeVF(VF.Width, CM.getVScaleForTuning());
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david-arm wrote:

Not sure what you mean by 'unrelated'? Are you referring to the s/VScale/CM.getVScaleForTuning()/? If so, this is related to the patch since I'm passing in LoopVectorizationCostModel, and have removed the `VScale` function argument.

https://github.com/llvm/llvm-project/pull/126235