Reduce allocation pressure#3
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This PR reduces allocation pressure in FlowSched hot paths.
Changes:
In my worldgen stress test, JFR showed ExecutorManager.tryLock() / FreeableTaskList as a major allocation source before this change. After the patch, that allocation site disappeared from the top allocation sites.
Observed result in the my test setup:
This pr was coworked with Codex
This pr is the re-targeted version of #2