Add TypeDescriptionProviders to XLinq

src/System.ComponentModel.TypeConverter/ref/System.ComponentModel.TypeConverter.cs

@@ -14,6 +14,7 @@
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.ComponentModel.ISupportInitialize))]
 // moved to System.ObjectModel
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.ComponentModel.TypeConverterAttribute))]
+[assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.ComponentModel.TypeDescriptionProviderAttribute))]
 
 namespace System
 {
@@ -583,13 +584,6 @@ protected TypeDescriptionProvider(System.ComponentModel.TypeDescriptionProvider
         public virtual System.ComponentModel.ICustomTypeDescriptor GetTypeDescriptor(System.Type objectType, object instance) { throw null; }
         public virtual bool IsSupportedType(System.Type type) { throw null; }
     }
-    [System.AttributeUsageAttribute((System.AttributeTargets)(4), Inherited = true)]
-    public sealed partial class TypeDescriptionProviderAttribute : System.Attribute
-    {
-        public TypeDescriptionProviderAttribute(string typeName) { }
-        public TypeDescriptionProviderAttribute(System.Type type) { }
-        public string TypeName { get { throw null; } }
-    }
     public sealed partial class TypeDescriptor
     {
         internal TypeDescriptor() { }

src/System.ComponentModel.TypeConverter/src/ILLinkTrim.xml

@@ -1,5 +1,6 @@
 <linker>
   <assembly fullname="System.ComponentModel.TypeConverter">
+    <type fullname="MS.Internal.Xml.Linq.ComponentModel.*" />
     <type fullname="System.ComponentModel.TypeDescriptor">
       <!-- called through reflection by System.ComponentModel.DefaultValueAttribute -->
       <method name="ConvertFromInvariantString" />