Alexis Laferrière 552d3a4984 [Sema] Restrict reexported SPIs to modules with an export_as relationship ...

@_exported exports SPIs only when the exported module defines export_as
pointing to the exporter module. Other reexports do not reexport SPIs.
This is to prevent SPI reexporting to get out of hands with the wide
reexports of the Objective-C world.

rdar://102335473

2022-11-14 13:17:55 -08:00

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