Fixup: remove dead code in InstPrinter

Author: gonzalobg

llvm/lib/Target/NVPTX/MCTargetDesc/NVPTXInstPrinter.cpp

@@ -256,18 +256,6 @@ void NVPTXInstPrinter::printLdStCode(const MCInst *MI, int OpNum,
         report_fatal_error(OS.str());
         break;
       }
-    } else if (!strcmp(Modifier, "sc")) {
-      auto Ordering =
-          NVPTX::Ordering(static_cast<NVPTX::OrderingUnderlyingType>(Imm));
-      switch (Ordering) {
-        // TODO: refactor fence insertion in ISelDagToDag instead of here
-        // as part of implementing atomicrmw seq_cst.
-      case NVPTX::Ordering::SequentiallyConsistent:
-        O << "fence.sc.sys;\n\t";
-        break;
-      default:
-        break;
-      }
     } else if (!strcmp(Modifier, "addsp")) {
       switch (Imm) {
       case NVPTX::PTXLdStInstCode::GLOBAL: