Did llvm ever use git rev-list for "revision" numbers?

Back in: Moving LLVM Projects to GitHub — LLVM 18.0.0git documentation there was some discussion of using git rev-list to generate a monotonic sequence number to replace SVN revisions. Was this ever done? Grepping llvm-project suggests no, but maybe I missed something. Asking because I’m doing this for an internal repo and looking for external examples.

Isn’t this just running git rev-list --count? What are you looking for exactly?