[de-duplication] fix bug causing under-aggregation
[de-duplication] fix bug causing under-aggregation

Reviewed By: jeremydubreil

Differential Revision: D6520644

fbshipit-source-id: f7bb550

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