The API digester tests were being run only for macOS, mainly
because they were not using %target-swift consistently. Lift
the unnecessary restriction so we run these tests more widely.
Framework authors can use SwiftWraper:none to bring back string enums
to type alias of String. When diagnosing source breaking changes, these
type alias are shown as removed. Therefore, it's hard to tell whether these
changes are automatically migratable. This patch refines the
removed-type-alias by further analyzing whether a
RawRepresentable with the same usr appeared in the later version of
SDK. If there is, another kind of message is emitted for differentiation.
This allows us to map back from a type to the declaration in the dump,
so that we can perform more fine-grained analysis like whether a string
has been changed to string enum.
When diagnosing API source-breaking changes, we
should also output the header file name from where the affected Clang
declaration is defined.
This may expedite screening process.
