Joe Groff 53e8e7b1d8 SILGen: Don't reference external property descriptors for @_alwaysEmitIntoClient properties. ...

Their definition is fully visible to clients to be copied into them, and there isn't necessarily
a symbol for the property descriptor in the defining module, so it isn't necessary or desirable to
try to use a property descriptor with them. Trying to reference the descriptor leads to missing
symbol errors at load time when trying to use keypaths with older versions of the defining dylib,
which goes against the purpose of `@_alwaysEmitIntoClient` meaning "no ABI liabilities for the
defining module". Fixes rdar://94049160.

2022-06-01 16:54:38 -07:00

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