Created attachment 622460 [details] [diff] [review] v0 I was hoping to do without this for GenerationalGC, but I may have been a bit optimistic. There are two things pushing me towards doing this now, rather than later. 1) I'm touching all of the call sites that would need this right now to update to an indirect IsAboutToBeFinalized. There's little point dumping this onto whoever ends up doing MovingGC, since I've already done most of the work. 2) I think we may need this for proto objects in the initial shape table, even for GenerationalGC.
Comment on attachment 622460 [details] [diff] [review] v0 I just noticed: could you replace 'table.match' with either 'match' or (if template errors...) HashTable::match?