Remove support for compiler plugins.

They've been deprecated for four years.

This commit includes the following changes.
- It eliminates the `rustc_plugin_impl` crate.
- It changes the language used for lints in
  `compiler/rustc_driver_impl/src/lib.rs` and
  `compiler/rustc_lint/src/context.rs`. External lints are now called
  "loaded" lints, rather than "plugins" to avoid confusion with the old
  plugins. This only has a tiny effect on the output of `-W help`.
- E0457 and E0498 are no longer used.
- E0463 is narrowed, now only relating to unfound crates, not plugins.
- The `plugin` feature was moved from "active" to "removed".
- It removes the entire plugins chapter from the unstable book.
- It removes quite a few tests, mostly all of those in
  `tests/ui-fulldeps/plugin/`.

Closes #29597.

compiler/rustc_interface/src/interface.rs

@@ -354,7 +354,7 @@ pub struct Config {
     pub hash_untracked_state: Option<Box<dyn FnOnce(&Session, &mut StableHasher) + Send>>,
 
     /// This is a callback from the driver that is called when we're registering lints;
-    /// it is called during plugin registration when we have the LintStore in a non-shared state.
+    /// it is called during lint loading when we have the LintStore in a non-shared state.
     ///
     /// Note that if you find a Some here you probably want to call that function in the new
     /// function being registered.

compiler/rustc_interface/src/passes.rs

@@ -23,11 +23,10 @@ use rustc_middle::util::Providers;
 use rustc_mir_build as mir_build;
 use rustc_parse::{parse_crate_from_file, parse_crate_from_source_str, validate_attr};
 use rustc_passes::{self, abi_test, hir_stats, layout_test};
-use rustc_plugin_impl as plugin;
 use rustc_resolve::Resolver;
 use rustc_session::code_stats::VTableSizeInfo;
 use rustc_session::config::{CrateType, Input, OutFileName, OutputFilenames, OutputType};
-use rustc_session::cstore::{MetadataLoader, Untracked};
+use rustc_session::cstore::Untracked;
 use rustc_session::output::filename_for_input;
 use rustc_session::search_paths::PathKind;
 use rustc_session::{Limit, Session};
@@ -75,25 +74,12 @@ fn count_nodes(krate: &ast::Crate) -> usize {
 
 pub(crate) fn create_lint_store(
     sess: &Session,
-    metadata_loader: &dyn MetadataLoader,
     register_lints: Option<impl Fn(&Session, &mut LintStore)>,
-    pre_configured_attrs: &[ast::Attribute],
 ) -> LintStore {
     let mut lint_store = rustc_lint::new_lint_store(sess.enable_internal_lints());
     if let Some(register_lints) = register_lints {
         register_lints(sess, &mut lint_store);
     }
-
-    let registrars = sess.time("plugin_loading", || {
-        plugin::load::load_plugins(sess, metadata_loader, pre_configured_attrs)
-    });
-    sess.time("plugin_registration", || {
-        let mut registry = plugin::Registry { lint_store: &mut lint_store };
-        for registrar in registrars {
-            registrar(&mut registry);
-        }
-    });
-
     lint_store
 }
 

compiler/rustc_interface/src/queries.rs

@@ -148,12 +148,8 @@ impl<'tcx> Queries<'tcx> {
             );
             let dep_graph = setup_dep_graph(sess, crate_name, stable_crate_id)?;
 
-            let lint_store = Lrc::new(passes::create_lint_store(
-                sess,
-                &*self.codegen_backend().metadata_loader(),
-                self.compiler.register_lints.as_deref(),
-                &pre_configured_attrs,
-            ));
+            let lint_store =
+                Lrc::new(passes::create_lint_store(sess, self.compiler.register_lints.as_deref()));
             let cstore = FreezeLock::new(Box::new(CStore::new(
                 self.codegen_backend().metadata_loader(),
                 stable_crate_id,