[llvm] [AArch64][SVE] Add partial reduction SDNodes (PR #117185)

[James Chesterman via llvm-commits]

JamesChesterman wrote:

> There are no changes to any of the tests, is that expected?

Yes this is expected. This patch is to change around the design of the ISD node to make it easier to use now as well as making it easier to use in future scenarios.

https://github.com/llvm/llvm-project/pull/117185