[clang] [clang-tools-extra] [flang] [lldb] [llvm] [openmp] [pstl] Finally formalise our defacto line-ending policy (PR #86318)

[Arthur Eubanks via cfe-commits]

aeubanks wrote:

I believe Chrome is also seeing many test failures due to this (https://crbug.com/374115887), although I haven't yet confirmed it's due to this specific commit.

https://github.com/llvm/llvm-project/pull/86318