shader: Initial recompiler work

src/shader_recompiler/frontend/maxwell/decode.h

@@ -0,0 +1,14 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "common/common_types.h"
+#include "shader_recompiler/frontend/maxwell/opcode.h"
+
+namespace Shader::Maxwell {
+
+[[nodiscard]] Opcode Decode(u64 insn);
+
+} // namespace Shader::Maxwell