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

[Kazu Hirata via llvm-commits]

kazutakahirata wrote:

I've fixed a warning from this PR with: https://github.com/llvm/llvm-project/commit/9099d694f6f7e84853d6add9c58a6535cdc62b3d

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