fixed the memory pool problem

Misaki.HighPerformance.LowLevel/Buffer/AllocationManager.cs

@@ -466,6 +466,7 @@ public static unsafe class AllocationManager
                 if (pStack != null)
                 {
                     pStack->Dispose();
+                    Free(pStack);
                 }
             }
 

Misaki.HighPerformance.LowLevel/Buffer/MemoryPool.cs

@@ -1,3 +1,4 @@
+using Misaki.HighPerformance.LowLevel.Utilities;
 using System.Runtime.CompilerServices;
 
 namespace Misaki.HighPerformance.LowLevel.Buffer;
@@ -15,7 +16,7 @@ public unsafe struct MemoryPool<TAllocator, TOpts> : IDisposable
     {
         var allocator = TAllocator.Create(opts);
 
-        _pAllocator = (TAllocator*)allocator.Allocate((nuint)sizeof(TAllocator), AlignOf<TAllocator>(), AllocationOption.None);
+        _pAllocator = (TAllocator*)Malloc((nuint)sizeof(TAllocator));
         *_pAllocator = allocator;
 
         _allocationHandle = new AllocationHandle
@@ -51,6 +52,8 @@ public unsafe struct MemoryPool<TAllocator, TOpts> : IDisposable
 
         _pAllocator->Dispose();
 
+        MemoryUtility.Free(_pAllocator);
+
         _pAllocator = null;
         _allocationHandle = default;
     }