session: disable internal lints for rustdoc

If an internal lint uses `typeck_results` or similar queries then that
can result in rustdoc checking code that it shouldn't (e.g. from other
platforms) and emit compilation errors.

Signed-off-by: David Wood <david.wood@huawei.com>

compiler/rustc_interface/src/passes.rs

@@ -210,7 +210,7 @@ pub fn register_plugins<'a>(
 
     let mut lint_store = rustc_lint::new_lint_store(
         sess.opts.unstable_opts.no_interleave_lints,
-        sess.unstable_options(),
+        sess.enable_internal_lints(),
     );
     register_lints(sess, &mut lint_store);