[llvm] [RISC-V] Limit vscale interleaving to addrspace 0. (PR #91573)

[Harald van Dijk via llvm-commits]

hvdijk wrote:

> Given that no other intrinsics support other address spaces should we just update the fixed length ones to use llvm_ptr_ty too?

Personally, I think it would be more useful to update the scalable ones in the future to support address spaces too, but I figured that would be a more contentious change. Right now, I'm just looking to get the simplest acceptable change in that stops the crashes.

https://github.com/llvm/llvm-project/pull/91573