[llvm] [DAG] Optimize masked store of constant lane mask to standard store (PR #223665)

[via llvm-commits]

Andarwinux wrote:

> Hi - is that from this patch? There should be a power2 check guarding against 9 element vectors. I don't see a crash locally - might there be a particular option I need?

Yes, this is the only DAG change recently. I just double-checked locally, the crash no longer happens after revert this commit.

https://github.com/llvm/llvm-project/pull/223665