Write Out DEF Files

write_def \
  -compressed \
  -routed_nets \
  -rows_tracks_gcells \
  -vias \
  -all_vias \
  -lef ${topLevel}.lef  \
  -regions_groups \
  -components \
  -pins \
  -blockages \
  -specialnets \
  -nets \
  -scanchain \
  -output ${topLevel}.def.gz