[llvm] [AArch64][GlobalISel] Legalize G_VECREDUCE_ADD bigger types (PR #68202)

[David Green via llvm-commits]

https://github.com/davemgreen commented:

Looks OK to me. Are there any tests anywhere for vecreduce.add that are non-extending? With types like v8i8 and v16i8, and I guess for this patch v32i8?

https://github.com/llvm/llvm-project/pull/68202