Simplify AUIPCC expansion.

Author: xdoardo

llvm/lib/Target/RISCV/RISCVExpandPseudoInsts.cpp

@@ -585,11 +585,9 @@ bool RISCVExpandPseudo::expandAuipccInstPair(
     auto MangledExportNameEnd = MangledExportName + "_end";
     auto MangledImportName = "__import_" + PrefixedImportNameWithPermissions;
     MCSymbol *MangledImportSymbol = Ctxt.getOrCreateSymbol(MangledImportName);
-    auto MangledImportSymbolOp =
-        MachineOperand::CreateMCSymbol(MangledImportSymbol, FlagsHi);
 
-    auto Op = BuildMI(NewMBB, DL, TII->get(RISCV::AUIPCC), TmpReg);
-    Op->addOperand(MangledImportSymbolOp);
+    BuildMI(NewMBB, DL, TII->get(RISCV::AUIPCC), TmpReg)
+        .addSym(MangledImportSymbol, FlagsHi);
 
     auto EncodedPermissions = CapAttr.encodePermissions();