Ellie Shin 72a7760027 Support package SIL linkage. ...

Decls with a package access level are currently set to public SIL
linkages. This limits the ability to have more fine-grained control
and optimize around resilience and serialization.
This PR introduces a separate SIL linkage and FormalLinkage for
package decls, pipes them down to IRGen, and updates linkage checks
at call sites to include package linkage.

Resolves rdar://121409846

2024-02-06 01:23:14 -08:00

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