Compute most of Public/Exported access level in rustc_resolve

Mak DefId to AccessLevel map in resolve for export

hir_id to accesslevel in resolve and applied in privacy
using local def id
removing tracing probes
making function not recursive and adding comments

Move most of Exported/Public res to rustc_resolve

moving public/export res to resolve

fix missing stability attributes in core, std and alloc

move code to access_levels.rs

return for some kinds instead of going through them

Export correctness, macro changes, comments

add comment for import binding

add comment for import binding

renmae to access level visitor, remove comments, move fn as closure, remove new_key

fmt

fix rebase

fix rebase

fmt

fmt

fix: move macro def to rustc_resolve

fix: reachable AccessLevel for enum variants

fmt

fix: missing stability attributes for other architectures

allow unreachable pub in rustfmt

fix: missing impl access level + renaming export to reexport

Missing impl access level was found thanks to a test in clippy

src/lib.rs

@@ -3,6 +3,7 @@
 #![warn(unreachable_pub)]
 #![recursion_limit = "256"]
 #![allow(clippy::match_like_matches_macro)]
+#![allow(unreachable_pub)]
 
 #[macro_use]
 extern crate derive_new;