rustc-ap-rustc_attr 727.0.0

Automatically published version of the package `rustc_attr` in the rust-lang/rust repository from commit 9a27044f42ace9eb652781b53f598e25d4e7e918 The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish

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Functions and types dealing with attributes and meta items. FIXME(Centril): For now being, much of the logic is still in `rustc_ast::attr`. The goal is to move the definition of `MetaItem` and things that don't need to be in `syntax` to this crate.