[llvm] [MachineCopyPropagation, Scheduler] Detect and fix suboptimal instruction order to enable optimizations (PR #98087)

[Quentin Colombet via llvm-commits]

qcolombet wrote:

> So what do you think of an implementation in MCP using the existing ScheduleDAG? 

That may work, but be careful about the compile time aspect of such approach. The impact needs to be negligible unless we show significant performance boost across the board (which I doubt we'll achieve)

https://github.com/llvm/llvm-project/pull/98087