Fix ephemeron scanning perf #691
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This was referenced Sep 13, 2023
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This PR fixes an issue when scanning ephemerons during full GC.
The issue caused ephemerons discovered during scanning to not be fired (if needed) in the same GC, needing multiple GCs to fire all the firable ephemerons in the list.
This PR fixes the tracing so that new ephemerons are scanned in the same loop.