[llvm] [NFC] Add myself as part of the list of contributors in `CREDITS` (PR #144035)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

My general thinking is that we should probably discontinue this file (as in, not add any new entries). Not many people add themselves here, even if they have made very substantial contributions.

The Maintainers.md file (including the list of historical maintainers) is probably more representative of major contributors by area, and the git history of contributors overall.

https://github.com/llvm/llvm-project/pull/144035