> There are thousands of contributors and the distribution is relatively flat (that is, it’s not the case that a small handful of people is responsible for the majority of contributions.)
This certainly varies across different parts of llvm-project. In flang, there's very much a "long tail". 80% of its 654K lines are attributed to the 17 contributors responsible for 1% or more of them, according to "git blame", out of 355 total.