[llvm] [LV] Honor -force-vector-interleave when generating diff checks (PR #225768)

[Florian Hahn via llvm-commits]

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

LGTM, thanks.

Please add a brief description to the PR description before landing.

This should be safe, as currenetly I don't think we have cases where we ever use an IC > UserIC

https://github.com/llvm/llvm-project/pull/225768