[llvm] [MachineScheduler] Add more debug prints w.r.t hazards and pending SUnits (PR #134328)

[Francesco Petrogalli via llvm-commits]

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

I have marked only one whitespace change, but in general, I think we should not be fixing them (unless of course FileCheck cares about them).

If you can, please revert the whitespace changes.



https://github.com/llvm/llvm-project/pull/134328