Ensure pending drain actions are processed when all tasks have exited epochs #205
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Fixes an issue when FASTER is used with many tasks or threads, doing fine-grained work on FASTER, i.e., resuming and suspending epochs frequently. The last thread to leave epoch protection may sometimes leave an item on the drain list, resulting in progress halt. This PR fixes the issue by checking if there are any actions to be drained in such a situation.
Fix #199