rustdoc: `pub use` for macros is inlined too eagerly

[petrochenkov]

pub use for macros is "inlined" (in rustdoc sense) too eagerly and may show duplicated documentation (both inlined and non-inlined) and ignore #[doc(no_inline)] and apparently #[doc(hidden)] (#35896 (comment)) as well.

This can now be observed on nightly docs for the standard library - https://doc.rust-lang.org/nightly/std/.
The "Re-exports" section wasn't there previously and everything was in inlined-only form.

[alexcrichton]

Looks like this affects beta as well - https://doc.rust-lang.org/beta/std/#reexports

[pietroalbini]

cc @rust-lang/rustdoc

[GuillaumeGomez]

Ah, indeed. I'll take a look as soon as possible.

[pietroalbini]

@GuillaumeGomez what's the status on this?