[llvm] [AArch64] Add invalid 1 x vscale costs for reductions and reduction-operations. (PR #102105)

[Ramkumar Ramachandra via llvm-commits]

https://github.com/artagnon commented:

The code changes look pretty straight-forward to me, but I think we should add a reduced version of the reported bug to LV/AArch64?

https://github.com/llvm/llvm-project/pull/102105