[clang] [Clang][SME2] Enable multi-vector loads & stores for SME2 (PR #75821)

[Dinar Temirbulatov via cfe-commits]

dtemirbulatov wrote:

> Should these builtins be `IsStreamingCompatible` until we add `IsStreamingOrSVE2p1`?

yes, it looks like this is the case. LGTM.

https://github.com/llvm/llvm-project/pull/75821