[aot] call_indirect optimization

[andreaTP]

As noted here, currently a call_indirect is compiled by the AOT to a trampoline method that leverage the public Machine.call function.
To do so, boxing to and from long[], is happening on both sides.

It should be possible to directly emit the final function invocation code inline or stored and accessible through a Map effectively removing the need for this code generation when using the compiled class file without AotMachine.

[andreaTP]

Fixed in #555 thanks to @electrum 🙏