[clang-tools-extra] Reland "[clang-tidy] fix bugprone-narrowing-conversions false positive for conditional expression" (PR #151874)

[Baranov Victor via cfe-commits]

https://github.com/vbvictor approved this pull request.

LGTM because every other tests use `x86_64-unknown-linux`.
Though I'm not sure why it has to be `x86_64-unknown-linux` and not `x86_64-unknown-unknown`. When tests run, only `arm` failed, so `x86_64_windows` must work too. But it is not a topic of this PR.

https://github.com/llvm/llvm-project/pull/151874