Add a ReserveNodes method to DfsVisitor. #3755
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This allows visitors to pre-allocate space for visited nodes, potentially reducing reallocations. The DataflowSimplificationPass now uses this to reserve space based on the function's node count. PiperOrigin-RevId: 862366169
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Add a ReserveNodes method to DfsVisitor.
This allows visitors to pre-allocate space for visited nodes, potentially reducing reallocations. The DataflowSimplificationPass now uses this to reserve space based on the function's node count.