[llvm] [VPlan] Improve cast code in VPlanRecipes (NFC) (PR #141240)

[Yingwei Zheng via llvm-commits]

================
@@ -85,8 +85,8 @@ bool VPRecipeBase::mayWriteToMemory() const {
   case VPWidenPHISC:
   case VPWidenSC:
   case VPWidenSelectSC: {
-    const Instruction *I =
-        dyn_cast_or_null<Instruction>(getVPSingleValue()->getUnderlyingValue());
+    const Instruction *I = dyn_cast_if_present<Instruction>(
----------------
dtcxzyw wrote:

`dyn_cast_or_null` has been deprecated.


https://github.com/llvm/llvm-project/pull/141240