Allan Shortlidge c3af951f38 AST: Get SPI status of PatternBindingDecl from anchoring VarDecl. ...

For property declarations, the `@_spi` attribute is attached to the VarDecl AST
node, rather than the PatternBindingDecl AST node, so the `isSPI()` query
should take this into account. Failing to do so caused the availability checker
to erroneously require that `@_spi` properties of types in `-library-level api`
libraries have availability annotations.

Resolves rdar://113587321.

2023-08-08 16:06:36 -07:00

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