Fix crash when loading test content records from the type metadata section. #1015
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Looks like #880 and/or #1010 caused a regression: the compiler appears to be dead-code-stripping the classes we emit to contain test content records. This PR changes the design back to using a protocol so that the members we need are always covered by
@_alwaysEmitConformanceMetadata
. This makes_TestDiscovery
a little harder to use with legacy lookup, but it's all experimental and eventually going to be removed anyway.Resolves rdar://146809312.
Checklist: