swift234

[CodeCompletion] Add image and color literals to results

Surface these results in the codecomplete code path (they're already
there in the codecomplete.open code path) so we can use them from IDEs.
For now, just use ad-hoc filtering to show them when the type matches
(or there is no expected type).  Ideally we would make this filtering
configurable like we do in the codecomplete.open code path.

rdar://problem/25836544