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Setting -fvisibility=hidden when compiling Target libs has the advantage of not being intrusive on the codebase, but it also sets the visibility of all functions within header-only component like ADT. In the end, we end up with some symbols with hidden visibility within llvm dylib (through the target libs), and some with external visibility (through other libs). This paves the way for subtle bugs like https://reviews.llvm.org/D101972 This patch explicitly set the visibility of some classes to `default` so that `llvm::Any` related symbols keep a `default` visibility. Indeed a template function with `default` visibility parametrized by a type with `hidden` visibility is granted `hidden` visibility, and we don't want this for the uniqueness of `llvm::Any::TypeId`. Differential Revision: https://reviews.llvm.org/D108943
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