swift

ff5d76fb - Sema: Synthesize availability queries for non-platform domains in RawRepresentable

Sema: Synthesize availability queries for non-platform domains in RawRepresentable Synthesis of `init(rawValue:)` and `rawValue` for enums conforming to `RawRepresentable` already handled enum elements with platform availability restrictions but needed to be updated to custom domain restrictions. This change also replaces the SILGen tests for `RawRepresentable` availability with `-print-ast` tests that check the synthesized bodies of the derived `RawRepresentable`, `Equatable`, and `Hashable` members directly. The new tests are more comprehensive, both in their coverage of interesting cases, but also in the completeness of the output that they check, while also being easier to understand and maintain. Resolves rdar://184726675.