[llvm] [llvm] Ensure newline at the end of files (NFC) (PR #143061)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> As an error? I thought it just reported it similar to `git` and let you proceed either way.

It's a whitespace warning. It let's you proceed but there is no reason to ignore it



https://github.com/llvm/llvm-project/pull/143061