[AMDGPU] Make use of CPol::SWZ_* in SelectionDAG. NFC.

For GlobalISel this was already done in
AMDGPUInstructionSelector::selectBufferLoadLds.

Author: jayfoad

llvm/lib/Target/AMDGPU/SIISelLowering.cpp

@@ -9453,6 +9453,7 @@ SDValue SITargetLowering::LowerINTRINSIC_VOID(SDValue Op,
   case Intrinsic::amdgcn_raw_ptr_buffer_load_lds:
   case Intrinsic::amdgcn_struct_buffer_load_lds:
   case Intrinsic::amdgcn_struct_ptr_buffer_load_lds: {
+    assert(!AMDGPU::isGFX12Plus(*Subtarget));
     unsigned Opc;
     bool HasVIndex =
         IntrinsicID == Intrinsic::amdgcn_struct_buffer_load_lds ||
@@ -9505,8 +9506,8 @@ SDValue SITargetLowering::LowerINTRINSIC_VOID(SDValue Op,
     unsigned Aux = Op.getConstantOperandVal(8 + OpOffset);
     Ops.push_back(
       DAG.getTargetConstant(Aux & AMDGPU::CPol::ALL, DL, MVT::i8)); // cpol
-    Ops.push_back(
-      DAG.getTargetConstant((Aux >> 3) & 1, DL, MVT::i8));          // swz
+    Ops.push_back(DAG.getTargetConstant(
+        Aux & AMDGPU::CPol::SWZ_pregfx12 ? 1 : 0, DL, MVT::i8)); // swz
     Ops.push_back(M0Val.getValue(0)); // Chain
     Ops.push_back(M0Val.getValue(1)); // Glue