[SandboxVec][DAG] Fix MemDGNode chain maintenance when move destination is non-mem (#124227) This patch fixes a bug in the maintenance of the MemDGNode chain of the DAG. Whenever we move a memory instruction, the DAG gets notified about the move and maintains the chain of memory nodes. The bug was that if the destination of the move was not a memory instruction, then the memory node's next node would end up pointing to itself.
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