[llvm] [LAA] Avoid unprofitable unit-stride versioning (PR #225331)

[Ramkumar Ramachandra via llvm-commits]

https://github.com/artagnon commented:

This looks correct to me, but I'm finding it hard to reason about the changes in https://github.com/dtcxzyw/llvm-opt-benchmark-nightly/pull/1477, which seem like regressions -- I will hence kindly defer to another reviewer; perhaps David who's an expert at this sort of thing.

https://github.com/llvm/llvm-project/pull/225331