Sema: Distinguish implicitly visible memory layouts from the typical @frozen ones
#85868
+263
−160
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Refactor logic tracking memory layouts visible to clients to differentiate when they are explicitly set visible with
publicor@frozen, and when they are implicitly public (in non-library-evolution mode for a type without@_implementationOnly). This extra information is then used to customize the implicit use case behavior: providing a more precise diagnostics and allowing reference SPI and non-publicly imported decls.