Move the Reference.delocalize check

Summary:
Moving this check since `Reference.is_global` contains a delocalize
```
let is_global { global_resolution; _ } ~reference =
  Reference.delocalize reference |> GlobalResolution.global global_resolution |> Option.is_some
```

We still want to delocalize the output since `is_builtin_reference` expects a delocalized variable.

Reviewed By: arthaud

Differential Revision: D50205910

fbshipit-source-id: 872fbf6a1e579eb82bd495ba9bb0e503d2ba708d

source/interprocedural/callGraph.ml

@@ -1726,9 +1726,9 @@ let resolve_attribute_access_properties
 let as_global_reference ~resolution expression =
   match Node.value expression with
   | Expression.Name (Name.Identifier identifier) ->
-      let reference = Reference.delocalize (Reference.create identifier) in
+      let reference = Reference.create identifier in
       if Resolution.is_global resolution ~reference then
-        Some reference
+        Some (Reference.delocalize reference)
       else
         None
   | Name name -> (