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

[Henrik G. Olsson via llvm-commits]

hnrklssn wrote:

> Hi @hnrklssn, the test you added, escape-color.py seems to be failing on a Windows bot:
> 
> https://lab.llvm.org/buildbot/#/builders/46/builds/4703
> 
> Can you take a look and revert if you need time to investigate?

Yeah I saw that but I can't figure out why it's failing, so I'll revert: the two inputs to `diff` look the same to me...
I'll see if I can test it out on a Windows machine later and see what's going on there.

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