SIL: Allow package decls to be serialized when appropriate #70527
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#70100 prohibited
package
declarations from ever being serialized in order to solve a problem in which the declarations were being serialized inappropriately. That's too heavy handed, though, because an@_alwaysEmitIntoClient
function withpackage
access must be serialized because it has public non-abi linkage.Resolves rdar://104711625