Fix not calling TargetCustom PSVs printer

If the enum value was greater than the starting target custom value,
the custom printer wasn't called.

llvm-svn: 363386

lib/CodeGen/MachineOperand.cpp

@@ -1138,7 +1138,7 @@ void MachineMemOperand::print(raw_ostream &OS, ModuleSlotTracker &MST,
       printLLVMNameWithoutPrefix(
           OS, cast<ExternalSymbolPseudoSourceValue>(PVal)->getSymbol());
       break;
-    case PseudoSourceValue::TargetCustom:
+    default:
       // FIXME: This is not necessarily the correct MIR serialization format for
       // a custom pseudo source value, but at least it allows
       // -print-machineinstrs to work on a target with custom pseudo source