move cecil to trunk/managed/ add coment that 9.3.0 uses dlls from mono-addins and not that

//
// Author:
//   Jb Evain (jbevain@gmail.com)
//
// Copyright (c) 2008 - 2015 Jb Evain
// Copyright (c) 2008 - 2011 Novell, Inc.
//
// Licensed under the MIT/X11 license.
//
 
using System;
 
using MD = Mono.Cecil.Metadata;
 
namespace Mono.Cecil {
 
	public sealed class SentinelType : TypeSpecification {
 
		public override bool IsValueType {
			get { return false; }
			set { throw new InvalidOperationException (); }
		}
 
		public override bool IsSentinel {
			get { return true; }
		}
 
		public SentinelType (TypeReference type)
			: base (type)
		{
			Mixin.CheckType (type);
			this.etype = MD.ElementType.Sentinel;
		}
	}
}