[llvm] [VPlan] Relax address constraints during stride analysis (PR #209168)

[Mel Chen via llvm-commits]

Mel-Chen wrote:

> LGTM, but the title needs to be updated as well. Maybe something like
> 
> `[VPlan] Fix wrap flags/relax addr constraints in convertToStridedAccesses`.

The wrap flags issue is fixed by https://github.com/llvm/llvm-project/pull/209453, so I think the current title should be fine.

https://github.com/llvm/llvm-project/pull/209168