[llvm] [VPlan] Change parent of VPReductionRecipe to VPRecipeWithIRFlags. NFC (PR #130881)

[Luke Lau via llvm-commits]

================
@@ -2296,29 +2304,34 @@ class VPReductionRecipe : public VPSingleDefRecipe {
 protected:
   VPReductionRecipe(const unsigned char SC, const RecurrenceDescriptor &R,
                     Instruction *I, ArrayRef<VPValue *> Operands,
-                    VPValue *CondOp, bool IsOrdered, DebugLoc DL)
-      : VPSingleDefRecipe(SC, Operands, I, DL), RdxDesc(R),
+                    VPValue *CondOp, bool IsOrdered)
+      : VPRecipeWithIRFlags(SC, Operands, *I), RdxDesc(R),
         IsOrdered(IsOrdered) {
     if (CondOp) {
----------------
lukel97 wrote:

Should we set the RecurrenceDescriptor FMFs directly?

```suggestion
                    VPValue *CondOp, bool IsOrdered)
      : VPRecipeWithIRFlags(SC, Operands, R.getFastMathFlags(), I->getDebugLoc()), RdxDesc(R),
        IsOrdered(IsOrdered) {
    setUnderlyingValue(I);
    if (CondOp) {
```

I think this is closer to NFC. And that way we always have FMFs and you can remove the checks to `if (hasFastMathFlags())`. 

https://github.com/llvm/llvm-project/pull/130881