[llvm] [llvm] Include LLVM_REPOSITORY and LLVM_REVISION in tool version (PR #84990)

[Adrian Prantl via llvm-commits]

https://github.com/adrian-prantl approved this pull request.

That will make triaging a lot easier, and produce better version strings for downstream users.

https://github.com/llvm/llvm-project/pull/84990