[clang] [clang][Diags] Automatically format AP(S)Int values with separators (PR #161047)

[Timm Baeder via cfe-commits]

tbaederr wrote:

> Oooh, I really like this. Would be neat/a very appreciated followup to see if we could replace all the current places we do the old way, and use this instead. This separators view is way nicer.

Yup, we can create good-first-issue issues for that.

https://github.com/llvm/llvm-project/pull/161047