swift234

lookupVisibleDecls(): use correct abstractions of lookup kinds

Removes the boolean IsTypeLookup and OnlyInstanceMembers, which were totally
misleading.

This fixes some bugs in lookupVisibleDecls, which allows us to remove
workarounds in code completion, that were not correct in some corner cases.

Now we also code complete references to instance functions in static contexts,
but code completion results in this case state the type of the resulting object
incorrectly.


Swift SVN r6396