[llvm] fix(llvm/**.py): fix invalid escape sequences (PR #94035)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 commented:

Not a huge deal, but LLVM uses a different commit naming style than whatever you're using here:
> When the changes are restricted to a specific part of the code (e.g. a back-end or optimization pass), it is customary to add a tag to the beginning of the line in square brackets. For example, “[SCEV] …” or “[OpenMP] …”. This helps email filters and searches for post-commit reviews.

(From the developer policy)

https://github.com/llvm/llvm-project/pull/94035