Export function definitions without the undecorated signatures when used for building call graphs

Summary: So that we can save memory usage.

Reviewed By: arthaud

Differential Revision: D83182199

fbshipit-source-id: 993d1ea6aa878e1dcf98c44afe1644bf3782a30c

Author: Tianhan Lu

source/interprocedural/pyreflyApi.ml

@@ -1295,6 +1295,8 @@ module GlobalVariable = struct
     location: Location.t;
   }
   [@@deriving equal, compare, show]
+
+  let _ = pp
 end
 
 module ModuleGlobalsSharedMemory =
@@ -1342,6 +1344,8 @@ module ClassField = struct
     location: Location.t option;
   }
   [@@deriving equal, compare, show]
+
+  let _ = pp
 end
 
 module ClassFieldsSharedMemory =