[llvm] [AArch64][SDAG] Enable +sme2p2/+sve2p2 lowering for MSTORE (PR #217609)

[Benjamin Maxwell via llvm-commits]

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@@ -33922,17 +33827,11 @@ SDValue AArch64TargetLowering::LowerMSTORE(SDValue Op,
     return SDValue();
 
   EVT MaskVT = Store->getMask().getValueType();
-  EVT MaskExtVT = getPromotedVTForPredicate(MaskVT);
-  EVT MaskReduceVT = MaskExtVT.getScalarType();
   SDValue Zero = DAG.getConstant(0, DL, MVT::i64);
-
-  SDValue MaskExt =
-      DAG.getNode(ISD::ZERO_EXTEND, DL, MaskExtVT, Store->getMask());
-  SDValue CntActive =
-      DAG.getNode(ISD::VECREDUCE_ADD, DL, MaskReduceVT, MaskExt);
-  if (MaskReduceVT != MVT::i64)
-    CntActive = DAG.getNode(ISD::ZERO_EXTEND, DL, MVT::i64, CntActive);
-
+  SDValue CntActive = DAG.getNode(
+      ISD::INTRINSIC_WO_CHAIN, DL, MVT::i64,
+      DAG.getTargetConstant(Intrinsic::aarch64_sve_cntp, DL, MVT::i64),
+      Store->getMask(), Store->getMask());
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MacDue wrote:

Question: Is this part of the change an NFC?

https://github.com/llvm/llvm-project/pull/217609