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

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ldrumm wrote:

Yes. An RFC makes sense. None of us here speak for every windows developer. I will submit one to discourse once I iron out the kinks and am ready to try again

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