RISCV: Replace MCExpr::print with MCAsmInfo::printExpr

Follow-up to 18b67a7

Author: MaskRay

llvm/lib/Target/RISCV/RISCVAsmPrinter.cpp

@@ -432,7 +432,7 @@ bool RISCVAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
   if (Offset.isImm())
     OS << MCO.getImm();
   else if (Offset.isGlobal() || Offset.isBlockAddress() || Offset.isMCSymbol())
-    OS << *MCO.getExpr();
+    MAI->printExpr(OS, *MCO.getExpr());
 
   if (Offset.isMCSymbol())
     MMI->getContext().registerInlineAsmLabel(Offset.getMCSymbol());