[llvm] [VPlan] Emit VPVectorEndPointerRecipe for reverse interleave pointer adjustment (PR #144864)

[Florian Hahn via llvm-commits]

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@@ -1706,17 +1706,22 @@ class VPWidenGEPRecipe : public VPRecipeWithIRFlags {
 
 /// A recipe to compute a pointer to the last element of each part of a widened
 /// memory access for widened memory accesses of IndexedTy. Used for
-/// VPWidenMemoryRecipes that are reversed.
+/// VPWidenMemoryRecipes or VPInterleaveRecipes that are reversed.
 class VPVectorEndPointerRecipe : public VPRecipeWithIRFlags,
                                  public VPUnrollPartAccessor<2> {
   Type *IndexedTy;
 
+  /// The constant stride of the pointer computed by this recipe.
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fhahn wrote:

```suggestion
  /// The constant stride of the pointer computed by this recipe. The stride will be scaled by IndexedTy.
```

Would be good to make clear that the stride is not scaled, but a strid ein terms of IndexedTy unless I am missing something. There might be a clearer way to express this than my suggestion above.

https://github.com/llvm/llvm-project/pull/144864