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

[Florian Hahn via llvm-commits]

================
@@ -1573,6 +1575,39 @@ class VPWidenCallRecipe : public VPSingleDefRecipe {
 #endif
 };
 
+class VPHistogramRecipe : public VPRecipeBase {
----------------
fhahn wrote:

please document the new recipe

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