mark setIsOverloaded as deprecated
mark setIsOverloaded as deprecated

Summary: Users should migrate to `preprocess`

Reviewed By: praihan

Differential Revision: D30970104

fbshipit-source-id: 4790706d2382c55de02bf8d47c7b9088c6a4c0e3

facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift