Add EventCount implementation #21271
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Scope & Purpose
Initially I built this event count implementation for the new WorkstealingScheduler with a single thread pool, but it can probably also come in handy in other cases.
EventCount allows to wait for arbitrary predicates in non-blocking algorithms. Think of condition variable, but the wait predicate does not need to be protected by a mutex.
https://www.1024cores.net/home/lock-free-algorithms/eventcounts
This implementation is heavily inspired by the one in the Eigen library.
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