Reduce amount of change to the LifetimeScope

Author: alistairjevans

src/Autofac/Core/Lifetime/LifetimeScope.cs

@@ -69,10 +69,8 @@ public class LifetimeScope : Disposable, ISharingLifetimeScope, IServiceProvider
         /// <param name="componentRegistry">Components used in the scope.</param>
         /// <param name="parent">Parent scope.</param>
         protected LifetimeScope(IComponentRegistry componentRegistry, LifetimeScope parent, object tag)
+            : this(componentRegistry, tag)
         {
-            _sharedInstances[SelfRegistrationId] = this;
-            ComponentRegistry = componentRegistry ?? throw new ArgumentNullException(nameof(componentRegistry));
-            Tag = tag ?? throw new ArgumentNullException(nameof(tag));
             parentScope = parent ?? throw new ArgumentNullException(nameof(parent));
             RootLifetimeScope = parentScope.RootLifetimeScope;
         }