Revert any references that are on the machine stack after compacting #4510
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Since compaction can be concurrent, the machine stack is allowed to change while compaction is happening. When compaction finishes, there may be references on the machine stack that need to be reverted so that we can remove the read barrier.
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Since compaction can be concurrent, the machine stack is allowed to
change while compaction is happening. When compaction finishes, there
may be references on the machine stack that need to be reverted so that
we can remove the read barrier.