[llvm] [ScalarizeMaskedMemIntr] Don't use a scalar mask on GPUs (PR #104842)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> writing duplicate logic down in MIR legalization (is what I've gathered from the git history)

By "duplicate logic in MIR legalization" you mean workaround SelectionDAG having no way of introducing control flow during legalization 



https://github.com/llvm/llvm-project/pull/104842