Remove unsound-mir-opts for simplify_aggregate_to_copy

Author: dianqk

compiler/rustc_mir_transform/src/gvn.rs

@@ -1081,9 +1081,7 @@ impl<'body, 'tcx> VnState<'body, 'tcx> {
             }
         }
 
-        // unsound: https://github.com/rust-lang/rust/issues/132353
-        if tcx.sess.opts.unstable_opts.unsound_mir_opts
-            && let AggregateTy::Def(_, _) = ty
+        if let AggregateTy::Def(_, _) = ty
             && let Some(value) =
                 self.simplify_aggregate_to_copy(rvalue, location, &fields, variant_index)
         {

tests/mir-opt/pre-codegen/try_identity.old.PreCodegen.after.mir

@@ -19,14 +19,14 @@ fn old(_1: Result<T, E>) -> Result<T, E> {
     }
 
     bb1: {
-        _3 = move ((_1 as Ok).0: T);
-        _0 = Result::<T, E>::Ok(copy _3);
+        _3 = copy ((_1 as Ok).0: T);
+        _0 = copy _1;
         goto -> bb3;
     }
 
     bb2: {
-        _4 = move ((_1 as Err).0: E);
-        _0 = Result::<T, E>::Err(copy _4);
+        _4 = copy ((_1 as Err).0: E);
+        _0 = copy _1;
         goto -> bb3;
     }