[llvm] [VPlan] Fix crash with EVL tail folding intrinsic with no corresponding VP (PR #121542)

[Florian Hahn via llvm-commits]

================
@@ -1498,10 +1498,11 @@ static VPRecipeBase *createEVLRecipe(VPValue *HeaderMask,
               auto *CastR = cast<VPWidenCastRecipe>(CR);
               VPID = VPIntrinsic::getForOpcode(CastR->getOpcode());
             }
-            assert(VPID != Intrinsic::not_intrinsic && "Expected VP intrinsic");
+            if (VPID == Intrinsic::not_intrinsic)
----------------
fhahn wrote:

```suggestion

            // Not all intrinsics have a corresponding VP intrinsic.
            if (VPID == Intrinsic::not_intrinsic)
```

https://github.com/llvm/llvm-project/pull/121542