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

[Gábor Spaits via llvm-commits]

spaits wrote:

A similar patch like this caused 0.2% reduction on the size for coremark. This was that patch: https://github.com/llvm/llvm-project/pull/73924 . I don't know how big of an impact is that.

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