[llvm] [LV] Vectorize histogram operations (PR #99851)

[Florian Hahn via llvm-commits]

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@@ -438,6 +466,11 @@ class LoopVectorizationLegality {
   /// Returns true if the loop is vectorizable
   bool canVectorizeMemory();
 
+  /// If LAA cannot determine whether all dependences are safe, we may be able
+  /// to further analyse some unknown dependences and if they match a certain
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fhahn wrote:

There was a recent LAA fix, and the dependences should now be classified as `IndirectUnsafe` I think. Would be good to update the comment

https://github.com/llvm/llvm-project/pull/99851