[llvm] [AArch64] Fix scheduling information for arithmetic and logical instructions. (PR #113542)

[Rin Dobrescu via llvm-commits]

Rin18 wrote:

> One way to fix it might be to add a new resource, which there are 3 of, that represents the number of flag-setting instructions per cycles. It might not be exactly correct as it will use that resource in the same stage as issue, not in the decode/rename stage. If we add too many of those the scheduler could start to get confused too, making sub-optimal decision because it is caring about the wrong thing. It might be worth a try though, so see if it can solve the issue that way.

I've implemented this for both V1 and V2. Most of the changes in the tests come from adding the new flag resource to the MCA output.

https://github.com/llvm/llvm-project/pull/113542