[erl-lineage] Use serializable data in summary
[erl-lineage] Use serializable data in summary

Summary:
`Int.Set.t` for cannot be used in payloads, because it is not serialized
to results.db; replaced by `IntSet.t`

Reviewed By: jvillard

Differential Revision: D31063321

fbshipit-source-id: 6daec6c50

jvillard/infer,jvillard/infer,facebook/infer,facebook/infer,jvillard/infer,jvillard/infer,facebook/infer,jvillard/infer,facebook/infer,facebook/infer,jvillard/infer,facebook/infer,jvillard/infer,facebook/infer