[llvm] [NFC] Eliminate needs of Emacs tag and file name in file headers (PR #118553)

[Nikita Popov via llvm-commits]

https://github.com/nikic approved this pull request.

LGTM, the discourse thread has a clear consensus that the emacs marker is no longer necessary, and the file name and impracticably short description are not useful.

https://github.com/llvm/llvm-project/pull/118553