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

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

@boomanaiden154 Is there any way we can add missing newlines to the code_formatter check as an error? I realise code_formatter is the check most likely to be ignored in a PR.....

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