[lit] Remove python 2.7 code paths in builtin diff Lit's builtin diff command had some Python 2.7 code paths lying around that we can probably get rid of at this point. LLVM at this point requires Python 3.8 at minimum. Keeping lit working at a lower version is a reasonable goal, but I think we can probably drop python 2 support at this point given how long it has been deprecated and how long LLVM has supported Python 3. Reviewers: jdenny-ornl, ilovepi, petrhosek Reviewed By: ilovepi Pull Request: https://github.com/llvm/llvm-project/pull/157558
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