Alexis Laferrière fb59f1fb11 Frontend: Enable @_spiOnly by default in Swift 6 ...

Enabling `@_spiOnly` also enables stronger type-checking of SPI decls.
As this could be source breaking, it has always been opt-in. Turn it on
by default in Swift 6 mode where the stronger type-checking will also
become expected.

At the same time, disable the old alternative to `@_spiOnly` which was
designed to be compatible with old compilers. Any user of that feature
should move to `@_spiOnly` or `package import` instead.

2024-03-14 07:06:36 -07:00

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