[llvm] [LV]Set tailfolding styles before computing feasible max VF. (PR #91403)

[Florian Hahn via llvm-commits]

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@@ -1629,6 +1635,14 @@ class LoopVectorizationCostModel {
                                        ElementCount MaxSafeVF,
                                        bool FoldTailByMasking);
 
+  /// true if scalable vectorization is supported and enabled.
+  std::optional<bool> IsScalableVectorizationAllowed;
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fhahn wrote:

move down to where the other member variables are define

https://github.com/llvm/llvm-project/pull/91403