Initial tessellation shader support (#2534)

* Initial tessellation shader support

* Nits

* Re-arrange built-in table

* This is not needed anymore

* PR feedback

Ryujinx.Graphics.Gpu/Shader/Cache/Definition/GuestGpuAccessorHeader.cs

@@ -49,10 +49,15 @@ namespace Ryujinx.Graphics.Gpu.Shader.Cache.Definition
         /// </summary>
         public InputTopology PrimitiveTopology;
 
+        /// <summary>
+        /// Tessellation parameters (packed to fit on a byte).
+        /// </summary>
+        public byte TessellationModePacked;
+
         /// <summary>
         /// Unused/reserved.
         /// </summary>
-        public ushort Reserved2;
+        public byte Reserved2;
 
         /// <summary>
         /// GPU boolean state that can influence shader compilation.