[cherry-pick] fix save inference model conditional op (#37579) #38739
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Describe
更新剪裁逻辑：
在以下三种情况，op 会被保留下来：
op 是 target，函数 IsTarget 判断
op 有 dependent outputs，即 op 在 feed 和 target 的通路上，函数 HasDependentOutputVar 判断
除了以上两种情况以外，涉及到 subblock 的 op 需要特殊处理。如果 op 有 subblock 或者在 subblock 中，并且 op 的 output vars 中有 feed vars，这样的 op 也需要保留下来。函数 IsSubBlockDependent 判断