Sort errors in pyre check

Reviewed By: shannonzhu

Differential Revision: D30503856

fbshipit-source-id: d489b96a2e74f887c96f78b4d614510baa5e2f7a

Author: grievejia

source/command/newCheckCommand.ml

@@ -151,7 +151,7 @@ let do_check configuration =
 let compute_errors ~configuration ~build_system () =
   let errors, ast_environment = do_check configuration in
   List.map
-    errors
+    (List.sort ~compare:Analysis.AnalysisError.compare errors)
     ~f:(Newserver.RequestHandler.instantiate_error ~build_system ~configuration ~ast_environment)