[Sema] Always install property wrappers during qualified lookup
Revert the property wrappers part of dd51251014476e66c141442cc5d17d263d54a3c1.
Every part of the qualified lookup stack needs to synthesize property
wrapper members, otherwise we'll be subject to the relativistic effects
of semantic lookups in different files. Besides, Codable was the main
source of cycles and circularity under the old scheme.
Resolves rdar://59531889
