GPU stabilization improvements to prevent calculation crashes

PerfectNumbers.Core/Gpu/AcceleratorPool.cs

@@ -0,0 +1,33 @@
+using ILGPU;
+using ILGPU.Runtime;
+
+namespace PerfectNumbers.Core.Gpu
+{
+    public struct AcceleratorPool(int capacity)
+	{
+		internal readonly Accelerator[] Accelerators = [.. Enumerable.Range(1, capacity).Select(_ => {
+			return SharedGpuContext.CreateAccelerator();
+		})];
+
+		private int _index;
+
+		public Accelerator Rent()
+		{
+			Atomic.CompareExchange(ref _index, capacity, 0);
+			var index = Atomic.Add(ref _index, 1);
+			if (index >= capacity)
+			{
+				index -= capacity;
+			}
+
+			return Accelerators[index];
+		}
+
+		public void Return(Accelerator accelerator)
+		{
+			// Intentionally left empty - there's nothing to do here. We're not really renting anything.
+		}
+
+		public static readonly AcceleratorPool Shared = new(PerfectNumberConstants.RollingAccelerators);
+	}
+}