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

[Ulrich Weigand via llvm-commits]

uweigand wrote:

> @uweigand: should we precommit this test now or do we wait until we are ready to actually commit this patch? 

Fine with me to precommit the test, so that we see the difference this patch makes.  I'll leave it up to you whether to do this right away or later.


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