[llvm] [VPlan] Implement interleaving as VPlan-to-VPlan transform. (PR #95842)

[Florian Hahn via llvm-commits]

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@@ -1572,3 +1572,421 @@ void VPlanTransforms::dropPoisonGeneratingRecipes(
     }
   }
 }
+
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fhahn wrote:

Not sure if that is needed, everything added in this patch to VPlanTransforms.cpp should be moved.

https://github.com/llvm/llvm-project/pull/95842