Allan Shortlidge e3c0d17875 SIL: Don't skip lowering obsolete decls. ...

When `-unavailable-decl-optimization=complete` is specified obsolete decls
should be preserved because their symbols are still ABI since they are
available to use when targeting deployment targets earlier than the obsoletion
version.

Resolves rdar://110268649

2023-06-05 20:30:06 -07:00

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