Followup to #26325 and #26330. This PR updates the IDE to forward certain helpers to these more efficient implementations.

This helps things out by more quickly being able to determine if a type even contains a member with name, and thus whether or not it should even be hydrated into a symbol and have its members created. Previous we would have to do a linear scan on all the members in a type to determine this. Now this data is in a set which can be queried much more efficiently.