[simple-lineage] Add atoms to lineage (as atoms)
[simple-lineage] Add atoms to lineage (as atoms)

Summary:
Previously, atoms appeared the same way as string constants. Now, string
constants are marked by "ConstantString" (as before), but atoms are
marked by "ConstantAtom".

Reviewed By: skcho

Differential Revision: D32670288

fbshipit-source-id: 90253e8105

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