LibJS: Work-in-progress JIT compiler :^)

Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/babdc0a25b
Pull-request: https://github.com/SerenityOS/serenity/pull/21619
Reviewed-by: https://github.com/Hendiadyoin1

Userland/Libraries/LibJS/JIT/NativeExecutable.h

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2023, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Noncopyable.h>
+#include <AK/Types.h>
+#include <LibJS/Runtime/Completion.h>
+
+namespace JS::JIT {
+
+class NativeExecutable {
+    AK_MAKE_NONCOPYABLE(NativeExecutable);
+    AK_MAKE_NONMOVABLE(NativeExecutable);
+
+public:
+    NativeExecutable(void* code, size_t size);
+    ~NativeExecutable();
+
+    void run(VM&);
+
+private:
+    void* m_code { nullptr };
+    size_t m_size { 0 };
+};
+
+}