Rudimentary filter out passes that dont need to run

Author: compiler-errors

compiler/rustc_lint/src/passes.rs

@@ -95,9 +95,17 @@ macro_rules! declare_combined_late_lint_pass {
         }
 
         impl<'tcx> $name<'tcx> {
-            $v fn new(_tcx: TyCtxt<'tcx>) -> Self {
+            $v fn new(tcx: TyCtxt<'tcx>) -> Self {
+                let lints_that_dont_need_to_run = tcx.lints_that_dont_need_to_run(());
                 let mut passes = vec![];
                 $(passes.push(Box::new($constructor) as Box<dyn LateLintPass<'tcx>>);)*
+                passes.retain(|pass| {
+                    let lints = (**pass).get_lints();
+                    // Lintless passes are always in
+                    lints.is_empty() ||
+                    // If the pass doesn't have a single needed lint, omit it
+                    !lints.iter().all(|lint| lints_that_dont_need_to_run.contains(&LintId::of(lint)))
+                });
                 $name { inner: RuntimeCombinedLateLintPass { passes } }
             }