[llvm] [LV] Support strided load with a stride of -1 (PR #128718)

[Florian Hahn via llvm-commits]

================
@@ -1743,18 +1746,20 @@ class VPVectorEndPointerRecipe : public VPRecipeWithIRFlags,
 
 /// A recipe to compute the pointers for widened memory accesses of IndexTy.
----------------
fhahn wrote:

Would be good to document the arguments

https://github.com/llvm/llvm-project/pull/128718