Make sure attributes used on subsequent shader stages are initialized (#2538)

Ryujinx.Graphics.Shader/StructuredIr/StructuredProgramInfo.cs

@@ -6,17 +6,11 @@ namespace Ryujinx.Graphics.Shader.StructuredIr
     {
         public List<StructuredFunction> Functions { get; }
 
-        public HashSet<int> IAttributes { get; }
-        public HashSet<int> OAttributes { get; }
-
         public HelperFunctionsMask HelperFunctionsMask { get; set; }
 
         public StructuredProgramInfo()
         {
             Functions = new List<StructuredFunction>();
-
-            IAttributes = new HashSet<int>();
-            OAttributes = new HashSet<int>();
         }
     }
 }