[llvm] [LAA] Enable diff checks for non-unit constant stride (PR #188826)

[Andrei Elovikov via llvm-commits]

https://github.com/eas commented:

> Can you also check the code that emits loop.dependence.war.mask in the vectorizer? I think it currently relies on the stride matching the step

Thanks, wasn't aware of this. IIUC, the semantics of the intrinsic makes it not applicable in the general case, so I added a bailout/assert/test.

https://github.com/llvm/llvm-project/pull/188826