fix: mcache skip manage > 1gb buffer #214
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当单个连续内存超过 1GB 时,mcache 极有可能创建双倍的连续内存,进而导致巨大的内存浪费。而这类 case 实际上应该交由 runtime 去管理内存,单纯 cache 提供的性能收益会被内存放大所吞噬。