Egor Zhdan 74c444d688 [cxx-interop] Emit function types as Swift closures in templated params ...

This is required to make the compiler distinguish between instantiations of `std::function`.

Previously, when generating a Swift type name for a `std::function` instantiation, we would always emit `_` as the template parameter. If someone referenced two different instantiations of `std::function` in a Swift module, they would get mangled with the same name, triggering linker errors later.

rdar://103979602

2024-01-19 21:02:03 +00:00

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