Roberto Ierusalimschy 9cf3299faf Threads don't need to always go to 'grayagain' ...

In incremental mode, threads don't need to be visited again once
visited in the atomic phase. In generational mode (where all visits
are in the atomic phase), only old threads need to be kept in the
'grayagain' list for the next cycle.

2020-08-03 14:28:13 -03:00

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