Add support for full-range 64 bit lightuserdata.

doc/status.html

@@ -91,17 +91,6 @@ handled correctly. The error may fall through an on-trace
 <tt>lua_atpanic</tt> on x64. This issue will be fixed with the new
 garbage collector.
 </li>
-<li>
-LuaJIT on 64 bit systems provides a <b>limited range</b> of 47 bits for the
-<b>legacy <tt>lightuserdata</tt></b> data type.
-This is only relevant on x64 systems which use the negative part of the
-virtual address space in user mode, e.g. Solaris/x64, and on ARM64 systems
-configured with a 48 bit or 52 bit VA.
-Avoid using <tt>lightuserdata</tt> to hold pointers that may point outside
-of that range, e.g. variables on the stack. In general, avoid this data
-type for new code and replace it with (much more performant) FFI bindings.
-FFI cdata pointers can address the full 64 bit range.
-</li>
 </ul>
 <br class="flush">
 </div>