[clang] [clang-tools-extra] [clang-tidy] Fix performance-unnecessary-value-param (PR #109145)

[Nicolas van Kempen via cfe-commits]

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nicovank wrote:

Ha, TIL that `LLVM_ENABLE_ASSERTIONS` is only in `Debug` mode, not `RelWithDebInfo` which I use in my local build. I assume CI uses `Debug` so this is fine, just wanted to be sure something always breaks if ever this was changed again. Thanks!

https://github.com/llvm/llvm-project/pull/109145