Added the command that allowed me to use clang-format-8 without having to recompile llvm & clang to CONTRIBUTING.md.
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- rSTAGING55577b249220: Added guide for OSX users on how to install clang-format-8.
rABC55577b249220: Added guide for OSX users on how to install clang-format-8.
I ran npm install -g email@example.com. I had to delete/move some files due to conflicts with another installation, but after that, running arc diff succeeded. A fresh installation should work with just that command; otherwise the instructions can be amended to accomodate for additional problems.