[llvm] [AArch64] Enable masked load/store for Streaming-SVE with -march=armv8-a+sme (PR #163133)

[David Green via llvm-commits]

https://github.com/davemgreen approved this pull request.

Thanks. LGTM

Are you happy / do you need us to hit merge?

https://github.com/llvm/llvm-project/pull/163133