fix(threadpool regression): deadlock on Windows on fibonacci #509
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While fixing #502, PR #503 introduced a regression on x86 Windows, a waiter could deadlock when trying to sleep until task completion.
The fix is ensuring a full compiler and cache/memory barrier. Tested on MacOS ARM as well to ensure #502 stays fixed.
It's unsure why the issue appears only on Windows and not on Linux and it might be due to Windows Futex
waitsignaling.