Add assertion

Author: SamTebbs33

llvm/lib/Target/AArch64/AArch64ISelLowering.cpp

@@ -21772,6 +21772,11 @@ SDValue tryLowerPartialReductionToDot(SDNode *N,
                                       const AArch64Subtarget *Subtarget,
                                       SelectionDAG &DAG) {
 
+  assert(N->getOpcode() == ISD::INTRINSIC_WO_CHAIN &&
+         getIntrinsicID(N) ==
+             Intrinsic::experimental_vector_partial_reduce_add &&
+         "Expected a partial reduction node");
+
   if (!Subtarget->isSVEAvailable() && !Subtarget->isNeonAvailable())
     return SDValue();