Fix component equality failure

Minimal fix for NH-3480

Author: fredericDelaporte

src/NHibernate.Test/Async/NHSpecificTest/NH3480/Fixture.cs

@@ -68,8 +68,9 @@ public async Task TestAsync()
 					var entity = await (result.SingleAsync());
 
 					await (NHibernateUtil.InitializeAsync(entity.Children));
+					Assert.That(entity.Children, Has.Count.GreaterThan(0));
 				}
 			}
 		}
 	}
-}
+}

src/NHibernate.Test/NHSpecificTest/NH3480/Fixture.cs

@@ -57,8 +57,9 @@ public void Test()
 					var entity = result.Single();
 
 					NHibernateUtil.Initialize(entity.Children);
+					Assert.That(entity.Children, Has.Count.GreaterThan(0));
 				}
 			}
 		}
 	}
-}
+}

src/NHibernate/Type/ComponentType.cs

@@ -600,6 +600,11 @@ public override bool IsEqual(object x, object y, ISessionFactoryImplementor fact
 			{
 				return false;
 			}
+
+			var componentType = EntityMode == EntityMode.Poco ? ComponentTuplizer.MappedClass : typeof(IDictionary);
+			if (!componentType.IsInstanceOfType(x) || !componentType.IsInstanceOfType(y))
+				return false;
+
 			object[] xvalues = GetPropertyValues(x);
 			object[] yvalues = GetPropertyValues(y);
 			for (int i = 0; i < propertySpan; i++)