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Transform an optional op only if it is inside the subgraph.

This handler is typically use to handle original op: it is fine to keep them if they are inside the subgraph, otherwise they are just ignored.

info Transform._TmpInfo instance.
op the optional op to transform (or ignore).
keep_if_possible re-attach to the original op if possible, that is, if the source graph and the destination graph are the same.

The transformed op or None.