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

[David Sherwood via llvm-commits]

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

https://github.com/dtcxzyw/llvm-opt-benchmark-nightly/pull/1477 seems to show a significant decrease in loop loads eliminated. Presumably this is coming from the LoopLoadElimination pass? It would be good to have some tests similar to test/Transforms/LoopLoadElim/unknown-stride-known-dep.ll that expose the cases this PR is changing.

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