Simplify code

Signed-off-by: John Lu <[email protected]>

Author: LU-JOHN

llvm/lib/Target/AMDGPU/SIInstrInfo.cpp

@@ -7893,8 +7893,7 @@ void SIInstrInfo::moveToVALUImpl(SIInstrWorklist &Worklist,
 
     legalizeOperands(*NewInstr, MDT);
     MRI.replaceRegWith(Dest0.getReg(), DestReg);
-    addUsersToMoveToVALUWorklist(NewInstr->getOperand(0).getReg(), MRI,
-                                 Worklist);
+    addUsersToMoveToVALUWorklist(DestReg, MRI, Worklist);
     Inst.eraseFromParent();
   }
     return;
@@ -7921,8 +7920,7 @@ void SIInstrInfo::moveToVALUImpl(SIInstrWorklist &Worklist,
 
     legalizeOperands(*NewInstr, MDT);
     MRI.replaceRegWith(Dest.getReg(), DestReg);
-    addUsersToMoveToVALUWorklist(NewInstr->getOperand(0).getReg(), MRI,
-                                 Worklist);
+    addUsersToMoveToVALUWorklist(DestReg, MRI, Worklist);
     Inst.eraseFromParent();
   }
     return;