This re-exports the primitive types from libcore at `core::primitive` to allow
macro authors to have a reliable location to use them from.

Take advantage of the fact that `check_mod_attrs` marks attributes as
used and change their type to normal, so that any remaining uses will be
warned about by the unused attribute lint.

…tures

…olnay

Add primitive module to libcore

This re-exports the primitive types from libcore at `core::primitive` to allow
macro authors to have a reliable location to use them from.

Fixes rust-lang#44865

…crum

Deduplicate identifier printing a bit

rust-lang#67010 introduced a couple more subtly different ways to print an identifier.
This PR attempts to restore the order.

The most basic identifier printing interface is `Formatter`-based now, so `String`s are not allocated unless required.

r? @Mark-Simulacrum

Mark attributes consumed by `check_mod_attrs` as normal

Take advantage of the fact that `check_mod_attrs` marks attributes as
used and change their type to normal, so that any remaining uses will be
warned about by the unused attribute lint.

syntax: Remove `Nt(Impl,Trait,Foreign)Item`

Follow-up to rust-lang#69366.
r? @Centril

remove redundant clones and import

…, r=Dylan-DPC

Clean up e0370 e0371

r? @Dylan-DPC

…=Mark-Simulacrum

[master] Backport release notes of 1.41.1

r? @Mark-Simulacrum