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

[Krzysztof Drewniak via llvm-commits]

krzysz00 wrote:

I can say that the commit that added the logic is b70026c43c and @topperc might know whether it's still worth keeping around

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