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We occasionally have some public `foo.h` header that includes a private `foo_arch.h` header. Users are expected to include the `foo.h` header and not the `foo_arch.h`. However, clangd will claim that the `#include` of `foo.h` is unused if only functions / macros/ types / ... from `foor_arch.h` is used and nothing from `foo.h`. This adds the `IWYU pragma: export` comment to the include of `foo_arch.h` in `foo.h`, so that clangd treats functions / macros / types provided by `foo_arch.h` as if they were instead provided by `foo.h`, which fixes the false positives.