[llvm] [MachineOutliner] Preserve instruction bundles (PR #106402)

[Oliver Stannard via llvm-commits]

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

Even if we don't outline constant pool references at the moment, I think `TargetInstrInfo::duplicate` is the safer choice, in case either we do start outlining them, or `ARMBaseInstrInfo::duplicate` need in the future to handle something we do outline.

LGTM assuming you make that change.

https://github.com/llvm/llvm-project/pull/106402