[llvm] [LV] Convert scatter w/uniform addr and mask being header mask to scalar store. (PR #172799)

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github-actions[bot] wrote:

test-suite diff from 5b8402744696bd1e6bb6849e87bd63c7401e4791...122fc00394619f22daf79d81a9d0b5668223c0fa: https://github.com/llvm/llvm-project/actions/runs/27323183247/artifacts/7555984237

https://github.com/llvm/llvm-project/pull/172799