message: Don't create var if it exists
diff: @@ -1961,9 +1961,12 @@ static void BuildVarList(SstStream Stream, TSMetadataMsg MetaData,
  }
  else
  {
  - VarRec->Variable = Stream->VarSetupUpcall(Stream->SetupUpcallReader,
  - VarRec->VarName,
  - VarRec->Type, field_data);
  + if (!VarRec->Variable)
  + {
  + VarRec->Variable = Stream->VarSetupUpcall(
  + Stream->SetupUpcallReader, VarRec->VarName, VarRec->Type,
  + field_data);
  + }
  VarRec->PerWriterDataFieldDesc[WriterRank] = NULL;
  VarRec->PerWriterMetaFieldOffset[WriterRank] = FieldOffset;
  }
  