[llvm] [SLP] More accurately cost RISCV scalar splats (PR #213104)

[Ryan Buchner via llvm-commits]

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@@ -15984,6 +15812,35 @@ class BoUpSLP::ShuffleCostEstimator : public BaseShuffleAnalysis {
     VectorizedVals.clear();
     SameNodesEstimated = true;
   }
+  void checkForFoldingSplat(const TreeEntry *E, ArrayRef<int> ReuseMask) {
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bababuck wrote:

Ping! @alexey-bataev 

https://github.com/llvm/llvm-project/pull/213104