[llvm] [NFC][LoopVectorize] Introduce new getEstimatedRuntimeVF function (PR #116247)

[Florian Hahn via llvm-commits]

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@@ -4300,6 +4300,17 @@ getVScaleForTuning(const Loop *L, const TargetTransformInfo &TTI) {
   return TTI.getVScaleForTuning();
 }
 
+static unsigned getEstimatedRuntimeVF(const Loop *L,
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fhahn wrote:

Would be gerat if you could add a comment here to document exactly what we mean by estimated runtime VF here

https://github.com/llvm/llvm-project/pull/116247