[AMDGPU] Remove #if 0 code for buffer stores in SIInsertWaitcnts (#92903)

Author: jayfoad

llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp

@@ -900,18 +900,6 @@ void WaitcntBrackets::updateByEvent(const SIInstrInfo *TII,
         }
       }
     }
-#if 0 // TODO: check if this is handled by MUBUF code above.
-  } else if (Inst.getOpcode() == AMDGPU::BUFFER_STORE_DWORD ||
-       Inst.getOpcode() == AMDGPU::BUFFER_STORE_DWORDX2 ||
-       Inst.getOpcode() == AMDGPU::BUFFER_STORE_DWORDX4) {
-    MachineOperand *MO = TII->getNamedOperand(Inst, AMDGPU::OpName::data);
-    unsigned OpNo;//TODO: find the OpNo for this operand;
-    RegInterval Interval = getRegInterval(&Inst, MRI, TRI, OpNo);
-    for (int RegNo = Interval.first; RegNo < Interval.second;
-    ++RegNo) {
-      setRegScore(RegNo + NUM_ALL_VGPRS, t, CurrScore);
-    }
-#endif
   } else /* LGKM_CNT || EXP_CNT || VS_CNT || NUM_INST_CNTS */ {
     // Match the score to the destination registers.
     for (unsigned I = 0, E = Inst.getNumOperands(); I != E; ++I) {