Ellie Shin 32f53d1eb8 Add implicit SPI import feature ...

API development sometimes requires a redesign while supporting early
adopters. Currently this is done by adding @_spi(name) to the API but
that requires adding the attribute in import statements as well, causing
manual overhead of adding and then removing when the redesign is done.

This PR introduces a special spi group name '_' and allows an implicit
spi import of a module containing API attributed with '@_spi(_)'

Resolves rdar://109797632

2023-06-01 15:33:04 -07:00

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