[llvm] [LV] Ignore some costs when loop gets fully unrolled (PR #106699)

[David Sherwood via llvm-commits]

https://github.com/david-arm commented:

I was just about to accept this @igogo-x86, but I suddenly spotted something. Sorry I didn't see this until now, although it's easily fixed. :(

https://github.com/llvm/llvm-project/pull/106699