[clang] [clang] Report narrowing conversions with const references (PR #75332)

[Erich Keane via cfe-commits]

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

Looks like you got what I meant anyway, and we WERE just passionately agreeing with eachother :)  LGTM.

https://github.com/llvm/llvm-project/pull/75332