[llvm] VPlan: use worklist in simplifyRecipes (PR #93998)

[Florian Hahn via llvm-commits]

================
@@ -1046,23 +1048,73 @@ static void simplifyRecipe(VPRecipeBase &R, VPTypeAnalysis &TypeInfo) {
         assert(TypeInfo.inferScalarType(VPV) == TypeInfo2.inferScalarType(VPV));
     }
 #endif
+    if (VPC)
+      return {VPC};
+    return {};
----------------
fhahn wrote:

```suggestion
    return VPC ? {VPC} : {}
```

https://github.com/llvm/llvm-project/pull/93998