Refactor attribute handling on the shader generator (#4565)

* Refactor attribute handling on the shader generator

* Implement gl_ViewportMask[]

* Add back the Intel FrontFacing bug workaround

* Fix GLSL transform feedback outputs mistmatch with fragment stage

* Shader cache version bump

* Fix geometry shader recognition

* PR feedback

* Delete GetOperandDef and GetOperandUse

* Remove replacements that are no longer needed on GLSL compilation on Vulkan

* Fix incorrect load for per-patch outputs

* Fix build

Ryujinx.Graphics.Shader/StructuredIr/IoDefinition.cs

@@ -0,0 +1,44 @@
+using Ryujinx.Graphics.Shader.IntermediateRepresentation;
+using System;
+
+namespace Ryujinx.Graphics.Shader.StructuredIr
+{
+    readonly struct IoDefinition : IEquatable<IoDefinition>
+    {
+        public StorageKind StorageKind { get; }
+        public IoVariable IoVariable { get; }
+        public int Location { get; }
+        public int Component { get; }
+
+        public IoDefinition(StorageKind storageKind, IoVariable ioVariable, int location = 0, int component = 0)
+        {
+            StorageKind = storageKind;
+            IoVariable = ioVariable;
+            Location = location;
+            Component = component;
+        }
+
+        public override bool Equals(object other)
+        {
+            return other is IoDefinition ioDefinition && Equals(ioDefinition);
+        }
+
+        public bool Equals(IoDefinition other)
+        {
+            return StorageKind == other.StorageKind &&
+                   IoVariable == other.IoVariable &&
+                   Location == other.Location &&
+                   Component == other.Component;
+        }
+
+        public override int GetHashCode()
+        {
+            return (int)StorageKind | ((int)IoVariable << 8) | (Location << 16) | (Component << 24);
+        }
+
+        public override string ToString()
+        {
+            return $"{StorageKind}.{IoVariable}.{Location}.{Component}";
+        }
+    }
+}