Add nullability to CreateInstance in TypeDescriptor/TypeDescriptionProvider to match Activator.CreateInstance

src/libraries/System.ComponentModel.TypeConverter/src/System/ComponentModel/DelegatingTypeDescriptionProvider.cs

@@ -36,7 +36,7 @@ internal DelegatingTypeDescriptionProvider(Type type)
             IServiceProvider? provider,
             [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)] Type objectType,
             Type[]? argTypes,
-            object[]? args)
+            object?[]? args)
         {
             return Provider.CreateInstance(provider, objectType, argTypes, args);
         }

src/libraries/System.ComponentModel.TypeConverter/src/System/ComponentModel/ReflectTypeDescriptionProvider.cs

@@ -260,7 +260,7 @@ internal static void AddEditorTable(Type editorBaseType, Hashtable table)
             IServiceProvider? provider,
             [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)] Type objectType,
             Type[]? argTypes,
-            object[]? args)
+            object?[]? args)
         {
             Debug.Assert(objectType != null, "Should have arg-checked before coming in here");
 
@@ -277,9 +277,9 @@ internal static void AddEditorTable(Type editorBaseType, Hashtable table)
                     argTypes = new Type[args.Length];
                     for (int idx = 0; idx < args.Length; idx++)
                     {
-                        if (args[idx] != null)
+                        if (args[idx] is object arg)
                         {
-                            argTypes[idx] = args[idx].GetType();
+                            argTypes[idx] = arg.GetType();
                         }
                         else
                         {

src/libraries/System.ComponentModel.TypeConverter/src/System/ComponentModel/TypeDescriptionProvider.cs

@@ -54,7 +54,7 @@ protected TypeDescriptionProvider(TypeDescriptionProvider parent)
             IServiceProvider? provider,
             [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)] Type objectType,
             Type[]? argTypes,
-            object[]? args)
+            object?[]? args)
         {
             if (_parent != null)
             {

src/libraries/System.ComponentModel.TypeConverter/src/System/ComponentModel/TypeDescriptor.cs

@@ -395,7 +395,7 @@ public static EventDescriptor CreateEvent(
             IServiceProvider? provider,
             [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)] Type objectType,
             Type[]? argTypes,
-            object[]? args)
+            object?[]? args)
         {
             ArgumentNullException.ThrowIfNull(objectType);
 
@@ -3015,7 +3015,7 @@ internal TypeDescriptionNode(TypeDescriptionProvider provider)
                 IServiceProvider? provider,
                 [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)] Type objectType,
                 Type[]? argTypes,
-                object[]? args)
+                object?[]? args)
             {
                 ArgumentNullException.ThrowIfNull(objectType);