[lworld] RFR(M): Multiple compiler fixes and refactoring

[Tobias Hartmann]

Hi Roland,

On 27.06.2018 12:32, Roland Westrelin wrote:
> That one can (and should) be restricted to the root of the compilation
> (depth() == 1).

Yes, I'll do that with a follow up change that I already have in my queue.

> Except for that, looks good.

Thank you!

Best regards,
Tobias