Implement a Macro JIT (#1445)

* Implement a Macro JIT

* Nit: space

Ryujinx.Graphics.Gpu/Engine/MME/MacroJit.cs

@@ -0,0 +1,39 @@
+using Ryujinx.Graphics.Gpu.State;
+using System;
+using System.Collections.Generic;
+
+namespace Ryujinx.Graphics.Gpu.Engine.MME
+{
+    /// <summary>
+    /// Represents a execution engine that uses a Just-in-Time compiler for fast execution.
+    /// </summary>
+    class MacroJit : IMacroEE
+    {
+        private readonly MacroJitContext _context = new MacroJitContext();
+
+        /// <summary>
+        /// Arguments FIFO.
+        /// </summary>
+        public Queue<int> Fifo => _context.Fifo;
+
+        private MacroJitCompiler.MacroExecute _execute;
+
+        /// <summary>
+        /// Executes a macro program until it exits.
+        /// </summary>
+        /// <param name="code">Code of the program to execute</param>
+        /// <param name="state">Current GPU state</param>
+        /// <param name="arg0">Optional argument passed to the program, 0 if not used</param>
+        public void Execute(ReadOnlySpan<int> code, GpuState state, int arg0)
+        {
+            if (_execute == null)
+            {
+                MacroJitCompiler compiler = new MacroJitCompiler();
+
+                _execute = compiler.Compile(code);
+            }
+
+            _execute(_context, state, arg0);
+        }
+    }
+}