[llvm] [AArch64] Support scalable vp.udiv/vp.sdiv with SVE (PR #154327)

[Paul Walker via llvm-commits]

paulwalker-arm wrote:

Thanks for the clarification.

 > So in my head I'm somewhat viewing llvm.vp.sdiv as not a regular VP intrinsic, but something more like llvm.masked.sdiv.

In which case I'd rather see the addition of `llvm.masked.sdiv` because it's more in keeping with the existing masked operations rather than mixing between the two styles.

https://github.com/llvm/llvm-project/pull/154327