perf: Use cached DependencyProperty comparer

src/Uno.UI/UI/Xaml/DependencyObjectStore.Binder.cs

@@ -35,7 +35,7 @@ public partial class DependencyObjectStore
 
 		private readonly object _gate = new object();
 
-		private readonly HashtableEx _childrenBindableMap = new HashtableEx();
+		private readonly HashtableEx _childrenBindableMap = new HashtableEx(DependencyPropertyComparer.Default);
 		private readonly List<object?> _childrenBindable = new List<object?>();
 
 		private bool _isApplyingTemplateBindings;

src/Uno.UI/UI/Xaml/DependencyPropertyComparer.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections;
 using System.Collections.Generic;
 using System.Text;
 
@@ -7,7 +8,7 @@ namespace Windows.UI.Xaml
 	/// <summary>
 	/// A dependency property comparer that assumes that instances are unique and that the hash code will never change.
 	/// </summary>
-	internal class DependencyPropertyComparer : IEqualityComparer<DependencyProperty>
+	internal class DependencyPropertyComparer : IEqualityComparer<DependencyProperty>, IEqualityComparer
 	{
 		/// <summary>
 		/// Gets the default instance of DependencyPropertyComparer. This class has no state and cannot be created.
@@ -18,14 +19,11 @@ private DependencyPropertyComparer()
 		{
 		}
 
-		public bool Equals(DependencyProperty x, DependencyProperty y)
-		{
-			return object.ReferenceEquals(x, y);
-		}
+		public bool Equals(DependencyProperty x, DependencyProperty y) => object.ReferenceEquals(x, y);
 
-		public int GetHashCode(DependencyProperty obj)
-		{
-			return obj.CachedHashCode;
-		}
+		public int GetHashCode(DependencyProperty obj) => obj.CachedHashCode;
+
+		bool IEqualityComparer.Equals(object x, object y) => object.ReferenceEquals(x, y);
+		int IEqualityComparer.GetHashCode(object obj) => obj is DependencyProperty dp ? dp.CachedHashCode : 0;
 	}
 }