[llvm] [llvm-lit] Process ANSI color codes in test output when formatting (PR #106776)

[Henrik G. Olsson via llvm-commits]

hnrklssn wrote:

Oh wait it's probably because of `\r\n` vs `\n`. I'll try again with `diff --strip-trailing-cr`.

https://github.com/llvm/llvm-project/pull/106776