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

[Simon Tatham via llvm-commits]

statham-arm wrote:

This seems to fix the immediate problem we noticed, but while searching for the API function that would fix it, I wondered if `TargetInstrInfo::duplicate` might be an even better choice than `MachineFunction::cloneMachineInstrBundle`. I don't fully understand the difference between the two.

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