Add a check to prevent an infinite loop in CallGraph::FoldComments.
Add a check to prevent an infinite loop in CallGraph::FoldComments.

PiperOrigin-RevId: 336851721
Change-Id: I95e84ac3353dadb269ef43b2132df28c738062e9

google/binexport,cblichmann/binexport,cblichmann/binexport,google/binexport,cblichmann/binexport,google/binexport