fix: Address review

src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/AvaloniaXamlIlLanguageParseIntrinsics.cs

@@ -285,7 +285,7 @@ namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions
                     , types.UriConstructor
                     , new List<IXamlAstValueNode>()
                     {
-                        new XamlConstantNode(node, types.String, uriText),
+                        new XamlConstantNode(node, context.Configuration.WellKnownTypes.String, uriText),
                         new XamlConstantNode(node, types.UriKind, (int)kind),
                     });
                 return true;

src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/Transformers/AvaloniaXamlIlWellKnownTypes.cs

@@ -105,7 +105,6 @@ namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions.Transformers
         public IXamlType IResourceDictionary { get; }
         public IXamlType ResourceDictionary { get; }
         public IXamlMethod ResourceDictionaryDeferredAdd { get; }
-        public IXamlType String { get; }
         public IXamlType UriKind { get; }
         public IXamlConstructor UriConstructor { get; }
 
@@ -239,9 +238,8 @@ namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions.Transformers
                 cfg.TypeSystem.GetType("System.Func`2").MakeGenericType(
                     cfg.TypeSystem.GetType("System.IServiceProvider"),
                     XamlIlTypes.Object));
-            String = cfg.TypeSystem.GetType("System.String");
             UriKind = cfg.TypeSystem.GetType("System.UriKind");
-            UriConstructor = Uri.GetConstructor(new List<IXamlType>() { String, UriKind });
+            UriConstructor = Uri.GetConstructor(new List<IXamlType>() { cfg.WellKnownTypes.String, UriKind });
         }
     }