4aac899406
Rework `#[doc(cfg(..))]` checks as distinct pass in rustdoc This PR reworks how rustdoc calls `rustc_attr_parsing::cfg_matches` to be in a separate pass, instead of being wired-up in a ad-hoc way, which is causing problems in https://github.com/rust-lang/rust/pull/138907#issuecomment-2920026627. This un-does most part of https://github.com/rust-lang/rust/pull/140894, but the result is IMO much cleaner, easier to reason about, and most importantly no longer interfears with rust-lang/rust#138907. r? `@GuillaumeGomez`