[llvm] Revert "[llvm][ScheduleDAG] SUnit::biasCriticalPath() does not find the critical path consistently (#92368)" (PR #92992)

[Mehdi Amini via llvm-commits]

joker-eph wrote:

Please don't wait for approval when reverting: the priority is to get back the bots to green so just push to main or merge immediately.

https://github.com/llvm/llvm-project/pull/92992