[llvm] [AArch64] MI Scheduler STP combine (PR #80188)

[David Green via llvm-commits]

https://github.com/davemgreen approved this pull request.

Thanks. These look OK to me. There is a chance they cause problems, we will need to keep an eye out in case anything comes up.

LGTM

https://github.com/llvm/llvm-project/pull/80188