How to nicely deal with ll_call and inlining

[lammich]

The code generator requires every function call being wrapped into ll_call. At the same time, the preprocessor performs a great deal of inlining, which either results in "stale" ll_calls, or the user having to be very aware of what exactly gets inlined.

One solution may be to make the code generator (silently) ignore stale ll_calls, which will (only) lead to over-estimation of the runtime.