Method calloc

Fleece/Support/ConcurrentArena.cc:59–65

    __hot
    void* ConcurrentArena::calloc(size_t size) {
        auto block = alloc(size);
        if (_usuallyTrue(block != nullptr))
            memset(block, 0, size);
        return block;
    }


    bool ConcurrentArena::free(void *block, size_t size) {