[llvm] [llvm-mca] Account for AcquireAtCycles in llvm-mca (PR #80742)

[Wang Pengcheng via llvm-commits]

https://github.com/wangpc-pp requested changes to this pull request.

> It turns out the creator of a PR cannot request changes.

:-)

https://github.com/llvm/llvm-project/pull/80742