[llvm] [CodingStandard] Require Unix line endings for all files (PR #161228)

[Rahul Joshi via llvm-commits]

jurahul wrote:

> LGTM, but you should change the PR title and description to remove the use of "source" too, so that it doesn't appear in the commit message.

Done.

https://github.com/llvm/llvm-project/pull/161228