[llvm] [VPlanTransform] Specialize simplifyRecipe for VPSingleDefRecipe pointer. nfc (PR #165568)

[Florian Hahn via llvm-commits]

================
@@ -1245,39 +1241,39 @@ static void simplifyRecipe(VPRecipeBase &R, VPTypeAnalysis &TypeInfo) {
   if (match(Def, m_Intrinsic<Intrinsic::vp_merge>(m_True(), m_VPValue(A),
                                                   m_VPValue(X), m_VPValue())) &&
       match(A, m_c_BinaryOr(m_Specific(X), m_VPValue(Y))) &&
-      TypeInfo.inferScalarType(R.getVPSingleValue())->isIntegerTy(1)) {
+      TypeInfo.inferScalarType(Def->getVPSingleValue())->isIntegerTy(1)) {
----------------
fhahn wrote:

```suggestion
      TypeInfo.inferScalarType(Def)->isIntegerTy(1)) {
```

https://github.com/llvm/llvm-project/pull/165568