Make -Z time-passes less noisy

- Add the module name to `pre_AST_expansion_passes` and don't make it a
  verbose event (since it normally doesn't take very long, and it's
  emitted many times)
- Don't make the following rustdoc events verbose; they're emitted many times.
  + build_extern_trait_impl
  + build_local_trait_impl
  + build_primitive_trait_impl
  + get_auto_trait_impls
  + get_blanket_trait_impls
- Remove `get_auto_trait_and_blanket_synthetic_impls`; it's wholly
  covered by get_{auto,blanket}_trait_impls and not very useful.

compiler/rustc_expand/src/base.rs

@@ -929,7 +929,9 @@ pub struct ExtCtxt<'a> {
     pub force_mode: bool,
     pub expansions: FxHashMap<Span, Vec<String>>,
     /// Called directly after having parsed an external `mod foo;` in expansion.
-    pub(super) extern_mod_loaded: Option<&'a dyn Fn(&ast::Crate)>,
+    ///
+    /// `Ident` is the module name.
+    pub(super) extern_mod_loaded: Option<&'a dyn Fn(&ast::Crate, Ident)>,
 }
 
 impl<'a> ExtCtxt<'a> {
@@ -937,7 +939,7 @@ impl<'a> ExtCtxt<'a> {
         sess: &'a Session,
         ecfg: expand::ExpansionConfig<'a>,
         resolver: &'a mut dyn ResolverExpand,
-        extern_mod_loaded: Option<&'a dyn Fn(&ast::Crate)>,
+        extern_mod_loaded: Option<&'a dyn Fn(&ast::Crate, Ident)>,
     ) -> ExtCtxt<'a> {
         ExtCtxt {
             sess,