Previously `MCSchedModel::getReciprocalThroughput` ignored
`AcquireAtCycle` completey, this patch fixes it by using the largest
`(ReleaseAtCycle - AcquireAtCycle) / NumUnits` as inverse throughput.
Here are some technical explanations:
https://myhsu.xyz/llvm-sched-interval-throughput
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Co-authored-by: Julien Villette <julien.villette@sipearl.com>