Introducing the "lookup-constants runtime system" :)

[Henry Cejtin]

Yes, the _prim is a problem but I would guess that it basically never adds
any constants.  It only would if the _prim was a macro.  Actually, with the
native back end I suspect that that case just wouldn't work any way.
At any rate, I think that the option of collecting them all once would be
much more convenient, and if it failed, you would just add the new constants
and then proceed.