Add support for fragment shader interlock (#2768)

* Support coherent images

* Add support for fragment shader interlock

* Change to tree based match approach

* Refactor + check for branch targets and external registers

* Make detection more robust

* Use Intel fragment shader ordering if interlock is not available, use nothing if both are not available

* Remove unused field

Ryujinx.Graphics.Shader/CodeGen/Glsl/Instructions/InstGenFSI.cs

@@ -0,0 +1,29 @@
+namespace Ryujinx.Graphics.Shader.CodeGen.Glsl.Instructions
+{
+    static class InstGenFSI
+    {
+        public static string FSIBegin(CodeGenContext context)
+        {
+            if (context.Config.GpuAccessor.QueryHostSupportsFragmentShaderInterlock())
+            {
+                return "beginInvocationInterlockARB()";
+            }
+            else if (context.Config.GpuAccessor.QueryHostSupportsFragmentShaderOrderingIntel())
+            {
+                return "beginFragmentShaderOrderingINTEL()";
+            }
+
+            return null;
+        }
+
+        public static string FSIEnd(CodeGenContext context)
+        {
+            if (context.Config.GpuAccessor.QueryHostSupportsFragmentShaderInterlock())
+            {
+                return "endInvocationInterlockARB()";
+            }
+
+            return null;
+        }
+    }
+}