Remove WeakReference list in PredictionEnginePoolPolicy. #4992
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Accesses to this list are not thread-safe because we can be enumerating it on one thread (in Return) while another thread adds to it (in Create). The list is unnecessary because the PredictionEngine will always be "rooted". Either it was being held in memory by someone who got the PredictionEngine from the pool, or it is being held by the ObjectPool itself. So it won't ever be GC'd, and the WeakReference is not doing anything. Also, inherit from PooledObjectPolicy instead of IPooledObjectPolicy, so it can take the "fastPolicy" path in DefaultObjectPool. (See dotnet/extensions#318). Fix dotnet#4981
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Accesses to this list are not thread-safe because we can be enumerating it on one thread (in Return) while another thread adds to it (in Create).
The list is unnecessary because the PredictionEngine will always be "rooted". Either it was being held in memory by someone who got the PredictionEngine from the pool, or it is being held by the ObjectPool itself. So it won't ever be GC'd, and the WeakReference is not doing anything.
Also, inherit from PooledObjectPolicy instead of IPooledObjectPolicy, so it can take the "fastPolicy" path in DefaultObjectPool. (See dotnet/extensions#318).
Fix #4981