We've got 
AP 
Tank and
utility support items. AD is the only class without a support item.
With an AD support item some champions like 
to go into the support role.
Heck even a new champion could be a support meant to go Bruiser instead of a Tank or Mage.
Cause they ain't supports....
As AD you'd either want or anyways.
I would still take Relic shield as an AD support.
Xin support is actually amazing if you're in duo que with the adc
We used to have Stark's Fervor , but it was destroyed/removed because Riot hates Iron Man.
This is the new meta support. WOrked everytime for me. And if you leave lane to roam its like double jungle and your bot lane doesnt know you left... because hell.... your
None of the champs you listed are supports though. Or at least, not very good ones.
