bug#37006: 27.0.50; garbage collection not happening after 26de2d42

[Mattias Engdegård]

12 aug. 2019 kl. 18.49 skrev Eli Zaretskii <eliz@gnu.org>:

> [...] We must
> have something in maybe_gc to notice the change and recompute the
> threshold.  We must also notice the memory-full condition there.

What about biasing consing_until_gc by gc_cons_threshold, and change the 
condition in maybe_gc to (the moral equivalent of)

 if (consing_until_gc < gc_cons_threshold)

? It is practically as cheap as the current test against 0.