[SPIRV] Remove a redundant cast (NFC) (llvm#165833)

FinalFlags is already of type unsigned.

Author: kazutakahirata

llvm/lib/Target/SPIRV/SPIRVModuleAnalysis.cpp

@@ -613,8 +613,7 @@ static void collectOtherInstr(MachineInstr &MI, SPIRV::ModuleAnalysisInfo &MAI,
               << FinalFlags << "\n";
           MachineInstr *OrigMINonConst = const_cast<MachineInstr *>(OrigMI);
           MachineOperand &OrigFlagsOp = OrigMINonConst->getOperand(2);
-          OrigFlagsOp =
-              MachineOperand::CreateImm(static_cast<unsigned>(FinalFlags));
+          OrigFlagsOp = MachineOperand::CreateImm(FinalFlags);
           return; // Merge done, so we found a duplicate; don't add it to MAI.MS
         }
       }