Method mark_external_deallocation

aiscript-arena/src/metrics.rs:198–201

(&self, bytes: usize)

    /// marked for allocation.
    #[inline]
    pub fn mark_external_deallocation(&self, bytes: usize) {
        cell_update(&self.0.total_external_bytes, |b| b.saturating_sub(bytes));
        cell_update(&self.0.freed_external_bytes, |b| b.saturating_add(bytes));
    }

    pub(crate) fn start_cycle(&self) {
        let pacing = self.0.pacing.get();