[llvm] [AArch64] Improve scheduling latency into Bundles (PR #86310)

[David Sherwood via llvm-commits]

https://github.com/david-arm commented:

The new function adjustSchedDependency added for AArch64Subtarget seems sensible and looks like a definite improvement from before. I just had a question about whether this interface change is needed?

https://github.com/llvm/llvm-project/pull/86310