Arnold Schwaighofer 2a2cf91dcd Add support for marking a _specialize attribute as SPI ...

```
  @_specialize(exported: true, spi: SPIGroupName, where T == Int)
  public func myFunc() { }
```

The specialized entry point is only visible for modules that import
using `_spi(SPIGroupName) import ModuleDefiningMyFunc `.

rdar://64993425

2020-10-12 09:19:29 -07:00

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