[llvm] [SystemZ] SLP reductions: cost functions of reductions and scalarization (PR #112491)

[Jonas Paulsson via llvm-commits]

JonPsson1 wrote:

To simplify the reivew-process I have reverted the SystemZ FP reduction costs part, so that only the insertion costs improvements are dealt with first (revert 9be511d to get them back).



https://github.com/llvm/llvm-project/pull/112491