Avoid reflect_type_class in serializer
Avoid reflect_type_class in serializer

Summary: [Thrift] Avoid `reflect_type_class` in `serializer`; now support only calls over structure or variant types.

Reviewed By: Mizuchi

Differential Revision: D24823737

fbshipit-source-id: a773c1b656afd7339b3fd22d58a98515dc01692b

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