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

[Sergei Barannikov via llvm-commits]

s-barannikov wrote:

I agree with @qcolombet
This looks like a job for [dependency breaker](https://github.com/llvm/llvm-project/blob/97324f6274184e607fa6d6cffb1aebee317d4644/llvm/lib/CodeGen/AggressiveAntiDepBreaker.h#L145), which I believe the "new" machine scheduler still doesn't use.


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