rustc-ap-rustc_attr 688.0.0

Automatically published version of the package `rustc_attr` in the rust-lang/rust repository from commit 25f6938da459a57b43bdf16ed6bdad3225b2a3ce 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.