[clang] Rework the printing of attributes (PR #87281)

[Vassil Vassilev via cfe-commits]

vgvassilev wrote:

> > @erichkeane, thank you. What's the process of including this in the next release?
> 
> After CI is complete, you can click "Squash and Merge" below (if you cannot, let us know and someone can do it for you), and it'll be included in the 19.1 release this summer.

I have commit access. I want this to be part of the 18.x releases as that breaks our downstream clients.

https://github.com/llvm/llvm-project/pull/87281