mlugg ae1b444d6a std.Progress: fix many bugs ...

There were several bugs with the synchronization here; most notably an
ABA problem which was causing #21663. I fixed that and some other
issues, and took the opportunity to get rid of the `.seq_cst` orderings
from this file. I'm at least relatively sure my new orderings are correct.

Co-authored-by: achan1989 <achan1989@gmail.com>
Resolves: #21663

2025-05-03 20:09:51 +01:00

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