Invalidate shaders when they are modified

Ryujinx.Graphics.Gpu/Shader/GraphicsShader.cs

@@ -0,0 +1,16 @@
+using Ryujinx.Graphics.GAL;
+
+namespace Ryujinx.Graphics.Gpu.Shader
+{
+    class GraphicsShader
+    {
+        public IProgram HostProgram { get; set; }
+
+        public CachedShader[] Shader { get; }
+
+        public GraphicsShader()
+        {
+            Shader = new CachedShader[5];
+        }
+    }
+}