[llvm] Mitigate pointless copies (PR #95052)

[James Henderson via llvm-commits]

https://github.com/jh7370 approved this pull request.

LGTM, pending pre-commit CI completing. I'd add `[NFC]` to the start of the PR title.

Do you need me to click the merge button?

https://github.com/llvm/llvm-project/pull/95052