[6.2] Sema: Narrow fix to allow @_spi_available
in extensions
#84330
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Allow referencing an
@_spi_available
decl in extensions to@_spi_available
types. This will unblock adopting the recent SDKs in CI as a swiftinterface has such a configuration. This is a narrow fix as it should really be handled as part of the context check but that check is currently too permissive.Fow now let's narrowly allow legal code. And then we should look at revisiting the SPI availability logic, separate it from normal SPI and treat it more like availability.
@_spi_available
and clang SPI.@_spi_available
in extensions #84238