Fix weakref unregister assertion after stack overflow - #23492
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Signed-off-by: ulofiai <309826581+ulofiai@users.noreply.github.com>
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Fixes #22650.
Handle the narrow case where a WeakReference is being unregistered after its referent has already disappeared from EG(weakrefs) during stack-overflow unwinding. Clear the stale IS_OBJ_WEAKLY_REFERENCED flag and return instead of asserting on a registry entry that is no longer present. Normal registered weakref invariants remain unchanged.