[llvm] [AArch64][SVE] Add dot product lowering for PARTIAL_REDUCE_MLA node (PR #130933)

[Benjamin Maxwell via llvm-commits]

MacDue wrote:

Oh wait, no it's Neon types that are failing, so it's because when `EnablePartialReduceNodes` is set we don't specify anything about fixed vectors. 

https://github.com/llvm/llvm-project/pull/130933