[Performance] Avoid unnecessary predicate allocations in RecyclePool.TryGetElementCore

[Youssef1313]

What would you like to be added

A simple loop instead of FindIndex will be more efficient.

Alternatively, introduce a FindIndex extension method like:

public int FindIndex(this List<T> list, TState state, Func<T, TState, bool> match)
{
  for (int i = 0; i < list.Count; i++)
  {
      if (match(list[i], state)) return i;
  }
  return -1;
}

// caller:
// elements.FindIndex(winrtOwner, (elemInfo, winrtOwner) => elemInfo.Owner == winrtOwner || elemInfo.Owner == null)

Why is this needed

No response

For which platform

No response

Anything else we need to know?

No response