Partial support for shader memory barriers

Ryujinx.Graphics.Shader/Decoders/OpCodeMemoryBarrier.cs

@@ -0,0 +1,14 @@
+using Ryujinx.Graphics.Shader.Instructions;
+
+namespace Ryujinx.Graphics.Shader.Decoders
+{
+    class OpCodeMemoryBarrier : OpCode
+    {
+        public BarrierLevel Level { get; }
+
+        public OpCodeMemoryBarrier(InstEmitter emitter, ulong address, long opCode) : base(emitter, address, opCode)
+        {
+            Level = (BarrierLevel)opCode.Extract(8, 2);
+        }
+    }
+}