Method remove

src/core/test/mem_alloc.cpp:129–135

    }

    void remove(void* addr) {
        MGB_LOCK_GUARD(m_mtx);
        auto iter = m_addr2size.find(reinterpret_cast<size_t>(addr));
        mgb_assert(iter != m_addr2size.end());
        m_cur_usage -= iter->second;
        m_addr2size.erase(iter);
    }

    size_t peak_usage() const { return m_peak_usage; }
};