fixbug: mem reuse ctrl safe guard when block has multi-sink #4497
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修复BUG: 内存复用的MemBlock,会在复用算法结束时给整个MemBlock连上用于保护临界区的控制边。之前PR #4415 在修改时,仅连接了sorted_tasks的begin和end,但其实可能会有多个sink节点,均需要连上控制边。这个PR修复了此BUG。