Shaders: Handle Ipa PASS argument as needed in Fragment Shaders (#392)

Ryujinx.Graphics/Gal/Shader/ShaderIrMetaIpa.cs

@@ -0,0 +1,12 @@
+namespace Ryujinx.Graphics.Gal.Shader
+{
+    class ShaderIrMetaIpa : ShaderIrMeta
+    {
+        public ShaderIpaMode Mode { get; private set; }
+
+        public ShaderIrMetaIpa(ShaderIpaMode Mode)
+        {
+            this.Mode = Mode;
+        }
+    }
+}