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

[Ramkumar Ramachandra via llvm-commits]

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artagnon wrote:

```suggestion
if (match(V, m_scev_Mul(m_SCEVConstant(), m_SCEV(m_scev_IntegralCast(m_SCEVUnknown(U)))))
return U;
```

I think this should be sufficient, as we don't delay getting the StrideBase any longer? I think you can introduce m_scev_IntegralCast, as the other PR shows?

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