cleaned console logs in MakeExpression function

Cleaned verbose logs leftovers (probably debug ones) that are currently printed on every compiling that involves dynamic objects...

mcs/mcs/nullable.cs

@@ -1010,8 +1010,6 @@ void EmitEquality (EmitContext ec)
 
 		public override SLE.Expression MakeExpression (BuilderContext ctx)
 		{
-			Console.WriteLine (":{0} x {1}", Left.GetType (), Right.GetType ());
-
 			return Binary.MakeExpression (ctx, Left, Right);
 		}
 	}