Benchmarks mostly reorganized & cleaned up. Simplified for re-runs.

Recyclable.Collections.Benchmarks/POC/ArraySizeLimitPoc.Benchmarks.cs

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+using BenchmarkDotNet.Attributes;
+using System.Buffers;
+
+namespace Recyclable.Collections.Benchmarks.POC
+{
+	public class ArraySizeLimitPocBenchmarks : PocBenchmarkBase
+	{
+		public static void Run()
+		{
+			var benchmark = new ArraySizeLimitPocBenchmarks();
+			benchmark.FindArraySizeLimit();
+		}
+
+		[Benchmark]
+		public void FindArraySizeLimit()
+		{
+			var pool = ArrayPool<object>.Shared;
+			var bufferSize = int.MaxValue;
+			var oldValue = 0;
+			while (true)
+			{
+				try
+				{
+					Console.WriteLine($"Allocating {bufferSize}");
+					var arr = pool.Rent((int)bufferSize);
+					var nextValue = (oldValue - bufferSize) >> 1;
+					if (nextValue == 0)
+					{
+						break;
+					}
+
+					oldValue = bufferSize;
+					bufferSize += nextValue;
+
+					pool.Return(arr);
+					GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced, true, true);
+				}
+				catch (Exception)
+				{
+					Console.WriteLine($"Error during array creation when {nameof(bufferSize)} = {bufferSize}");
+					var nextValue = (oldValue - bufferSize) >> 1;
+					if (nextValue == 0)
+					{
+						break;
+					}
+
+					oldValue = bufferSize;
+					bufferSize -= nextValue;
+				}
+			}
+
+			Console.WriteLine("All done");
+		}
+	}
+}