[llvm] [AArch64][SVE] Add dot product codegen for partial reductions with no binary operation on input (PR #120207)

[Sam Tebbs via llvm-commits]

https://github.com/SamTebbs33 approved this pull request.

Looks good to me :+1: See what Sander thinks though.

https://github.com/llvm/llvm-project/pull/120207