[llvm] [Workflow] Expand code-format-helper.py error reporting (PR #69686)

[Ryan Prichard via llvm-commits]

rprichard wrote:

It appears that darker/black process their file list using the currently-checked out files, not by querying git for the contents of the two git revisions. A newly-added file isn't checked out, because the current GitHub workflow checks something else out instead (the target branch of the PR maybe?)

https://github.com/rprichard/llvm-project/actions/runs/6622055992/job/17986970016?pr=10

I think the fix is to specify a different commit to checkout in pr-code-format.yml.


https://github.com/llvm/llvm-project/pull/69686