[llvm] [LV] Fix runtime-VF logic when generating RT-checks (PR #130118)

[David Sherwood via llvm-commits]

https://github.com/david-arm approved this pull request.

LGTM! Wow, this was a pretty serious bug. Thanks for the fix. Looks like we were also generating incorrect runtime checks.

https://github.com/llvm/llvm-project/pull/130118