rustdoc: Move doc-reachability visiting back to cleaning

It populates `cx.cache.access_levels`, which seems to be needed during
cleaning since a bunch of tests are failing.

src/librustdoc/clean/utils.rs

@@ -7,6 +7,7 @@ use crate::clean::{
 };
 use crate::core::DocContext;
 use crate::formats::item_type::ItemType;
+use crate::visit_lib::LibEmbargoVisitor;
 
 use rustc_ast as ast;
 use rustc_ast::tokenstream::TokenTree;
@@ -26,6 +27,11 @@ mod tests;
 crate fn krate(cx: &mut DocContext<'_>) -> Crate {
     let module = crate::visit_ast::RustdocVisitor::new(cx).visit();
 
+    for &cnum in cx.tcx.crates(()) {
+        // Analyze doc-reachability for extern items
+        LibEmbargoVisitor::new(cx).visit_lib(cnum);
+    }
+
     // Clean the crate, translating the entire librustc_ast AST to one that is
     // understood by rustdoc.
     let mut module = module.clean(cx);

src/librustdoc/formats/cache.rs

@@ -14,7 +14,6 @@ use crate::formats::Impl;
 use crate::html::markdown::short_markdown_summary;
 use crate::html::render::cache::{get_index_search_type, ExternalLocation};
 use crate::html::render::IndexItem;
-use crate::visit_lib::LibEmbargoVisitor;
 
 /// This cache is used to store information about the [`clean::Crate`] being
 /// rendered in order to provide more useful documentation. This contains
@@ -148,8 +147,6 @@ impl Cache {
         // FIXME: this part is specific to HTML so it'd be nice to remove it from the common code
         for &crate_num in cx.tcx.crates(()) {
             let e = ExternalCrate { crate_num };
-            // Analyze doc-reachability for extern items
-            LibEmbargoVisitor::new(cx).visit_lib(e.crate_num);
 
             let name = e.name(tcx);
             let render_options = &cx.render_options;