bug#39962: 27.0.90; Crash in Emacs 27.0.90

[Pip Cet]

> > Fine, so you are saying that stack marking should disregard whether a
> > buffer is "live"?  Then let's make such a change only for stack
> > marking, not in a function called from other places.
>
> I agree. I'll prepare a patch.

Here's the patch. Please let me know if anything else needs changing.

0001-Don-t-collect-reachable-killed-buffers-during-GC.patch
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