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

[Jonas Devlieghere via llvm-commits]

JDevlieghere wrote:

The linux failure (`DiagnosticTest.RespectsDiagnosticConfig`) is unrelated to my change. It fails locally with and without my changes. 

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