[llvm-branch-commits] [llvm] [AArch64] Tweak the cost-model of partial reductions to mitigate regressions from #181706 (PR #181707)

[Sander de Smalen via llvm-branch-commits]

sdesmalen-arm wrote:

This is a stacked PR. See other PRs below:
1. https://github.com/llvm/llvm-project/pull/181705
2. https://github.com/llvm/llvm-project/pull/181706
3. 👉 https://github.com/llvm/llvm-project/pull/181707

https://github.com/llvm/llvm-project/pull/181707