Looking to re-implement --xformers

[ZCaliber]

So, it seems a relatively easy process to put it back in. It's basically undoing the commit below:

Remove --sdp-attention, --xformers flags #5126

I already reverted the various parts taken out thus far, and acquired the missing module. Last step I need is actually putting in the argument.

All I'd need to do (In theory) is find where these are in the code and I'm golden. Anyone have an idea where I need to look?

Contrary to the commit, Xformers most certainly increased generation speeds by a fair margin, for me anyway.