[Serialization] Follow compatibility typealiases for non-generic types #16618
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Now that we use the C names of imported types in mangled names, it's safe to resolve a compatibility alias when a type gets an NS_SWIFT_NAME for the first time, rather than requiring the developer to recompile the imported library.
This doesn't include generic types, which only applies for Objective-C generics. There shouldn't be additional complications here but I want to be extra careful.
rdar://problem/39661212