Ben Barham f32f40550b [Runtime] Temporarily update attribute ordering ...

clang-15 requires `extern "C"` to be the first attribute and does not
allow mixing GNU attributes and standard attributes. Temporarily split
and re-order attributes to prevent compilation errors. Avoid updating
the public stdlib here (`Visibility.h`) and instead add the definitions
to `Config.h`, which all impacted headers and up including.

This should be removed once Swift uses at least stable/20221013, which
has https://reviews.llvm.org/D137979 and would thus allow us to just
move `SWIFT_RUNTIME_EXPORT` to be the first attribute.

Resolves https://github.com/apple/swift/issues/61468.

2022-12-18 11:18:16 -08:00

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