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

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csstormq wrote:

I have tried to push to main, but failed. I am trying to figure it out. Thank you for your quick response, @joker-eph .

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