Alexis Laferrière c0abde01a2 [Sema] @_exported imports export @_spi decls too ...

Enable transitive imports of all SPI groups through @_exported imports.
This brings to SPI the same behavior that we have for API.

```
// Module A
@_spi(S) public func foo() {}

// Module B
@_exported import A

// Module C
@_spi(S) import B

foo() // SPI imported through the reexport of A from B
```

rdar://101566534

2022-11-10 16:46:14 -08:00

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