rustc-ap-rustc_attr 689.0.0

Automatically published version of the package `rustc_attr` in the rust-lang/rust repository from commit b5c37e86ff1782923e3abfbf5491dd383fcf827d 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.