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rustc_metadata: Fix `encode_attrs` This function didn't do what the authors intended it to do. - Due to `move` in the closure `is_public` wasn't captured by mutalbe reference and wasn't used as a cache. - Due to iterator cloning all the `should_encode_attr` logic run for the second time to calculate `may_have_doc_links` This PR fixes these issues, and calculates all the needed attribute flags in one go. (Noticed while implementing https://github.com/rust-lang/rust/pull/107136.)