[cxx-interop] Fix the printing of types with generic arguments #75372
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Previously the code got the declaration for types with generic arguments and the printer used the declaration. This was a lossy operation, we printed the type with generic parameters instead of the arguments. This patch makes sure we print the type with the arguments. Unfortunately, the code structure is not the most clear, type printing is currently inherently part of the function signature printing. This code path needs to be factored out in the future to make the code easier to understand.
rdar://130679337