[llvm] [LV] Support tail-folded epilogue loops (PR #208764)

[Florian Hahn via llvm-commits]

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@@ -856,6 +856,10 @@ class LoopVectorizationPlanner {
   /// The profitability analysis.
   LoopVectorizationCostModel &CM;
 
+  /// The profitability analysis for epilogue tail-folding.
+  /// Cleared after making cost based decisions.
+  std::unique_ptr<LoopVectorizationCostModel> EpilogueTfCM;
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fhahn wrote:

What I meant is that it now is only used in `bool LoopVectorizationPlanner::planForEpilogueTF() {` to pass further down. So it seems that could also be done by just constructing it in `planForEpilogueTF`?

https://github.com/llvm/llvm-project/pull/208764