[clang] [clang-format] Honor later negated .clang-format-ignore patterns (PR #195432)

[via cfe-commits]

Dudenwatschn wrote:

Thanks for the approval, I've squashed my commits and rebased on top of main - it seems like I don't have the neccessary rights to complete the PR(?) - so you might have to merge at your own discretion.

Thanks!

https://github.com/llvm/llvm-project/pull/195432