Auto merge of #123322 - matthewjasper:remove-mir-unsafeck, r=lcnr,compiler-errors

Remove MIR unsafe check

Now that THIR unsafeck is enabled by default in stable I think we can remove MIR unsafeck entirely. This PR also removes safety information from MIR.

Author: bors

compiler/rustc_interface/src/passes.rs

@@ -748,9 +748,6 @@ fn analysis(tcx: TyCtxt<'_>, (): ()) -> Result<()> {
 
     sess.time("MIR_effect_checking", || {
         for def_id in tcx.hir().body_owners() {
-            if !tcx.sess.opts.unstable_opts.thir_unsafeck {
-                rustc_mir_transform::check_unsafety::check_unsafety(tcx, def_id);
-            }
             tcx.ensure().has_ffi_unwind_calls(def_id);
 
             // If we need to codegen, ensure that we emit all errors from

compiler/rustc_interface/src/tests.rs

@@ -840,7 +840,6 @@ fn test_unstable_options_tracking_hash() {
     tracked!(stack_protector, StackProtector::All);
     tracked!(teach, true);
     tracked!(thinlto, Some(true));
-    tracked!(thir_unsafeck, false);
     tracked!(tiny_const_eval_limit, true);
     tracked!(tls_model, Some(TlsModel::GeneralDynamic));
     tracked!(translate_remapped_path_to_local_path, false);