[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 ffa02793116a850767f34436d01344260ab03e1c...06ccdbc856ea023fb6d1065608b8c974711f2b8e: https://github.com/llvm/llvm-project/actions/runs/28424851896/artifacts/7974088494

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