[llvm] LAA: pre-commit tests for stride-versioning (PR #97570)

[Ramkumar Ramachandra via llvm-commits]

artagnon wrote:

Thanks for the review. I inherited the test from an existing test file, but omitted to clean it up. I've cleaned it up now, and verified that the stride-versioning code is hit.

https://github.com/llvm/llvm-project/pull/97570