[AArch64][SVE2] Use a PatFrag for URSHR (#81304)

Follow-up for #78374

Author: UsmanNadeem

llvm/lib/Target/AArch64/AArch64ISelLowering.cpp

@@ -20246,9 +20246,6 @@ static SDValue performIntrinsicCombine(SDNode *N,
   case Intrinsic::aarch64_sve_uqsub_x:
     return DAG.getNode(ISD::USUBSAT, SDLoc(N), N->getValueType(0),
                        N->getOperand(1), N->getOperand(2));
-  case Intrinsic::aarch64_sve_urshr:
-    return DAG.getNode(AArch64ISD::URSHR_I_PRED, SDLoc(N), N->getValueType(0),
-                       N->getOperand(1), N->getOperand(2), N->getOperand(3));
   case Intrinsic::aarch64_sve_asrd:
     return DAG.getNode(AArch64ISD::SRAD_MERGE_OP1, SDLoc(N), N->getValueType(0),
                        N->getOperand(1), N->getOperand(2), N->getOperand(3));

llvm/lib/Target/AArch64/AArch64SVEInstrInfo.td

@@ -232,7 +232,11 @@ def SDT_AArch64Arith_Imm : SDTypeProfile<1, 3, [
 ]>;
 
 def AArch64asrd_m1 : SDNode<"AArch64ISD::SRAD_MERGE_OP1", SDT_AArch64Arith_Imm>;
-def AArch64urshri_p : SDNode<"AArch64ISD::URSHR_I_PRED", SDT_AArch64Arith_Imm>;
+def AArch64urshri_p_node : SDNode<"AArch64ISD::URSHR_I_PRED", SDT_AArch64Arith_Imm>;
+
+def AArch64urshri_p : PatFrags<(ops node:$op1, node:$op2, node:$op3),
+                           [(int_aarch64_sve_urshr node:$op1, node:$op2, node:$op3),
+                            (AArch64urshri_p_node node:$op1, node:$op2, node:$op3)]>;
 
 def SDT_AArch64IntExtend : SDTypeProfile<1, 4, [
   SDTCisVec<0>, SDTCisVec<1>, SDTCisVec<2>, SDTCisVT<3, OtherVT>, SDTCisVec<4>,