NH-3755 - Fix overrides of members with the same names

Author: hazzik

src/NHibernate.Test/NHSpecificTest/NH3755/Fixture.cs

@@ -42,7 +42,7 @@ protected override void OnTearDown()
 			}
 		}
 
-		[Test, KnownBug("NH-3755")]
+		[Test]
 		public void TestCompositeProxy()
 		{
 			using (var session = OpenSession())

src/NHibernate/Proxy/DynamicProxy/DefaultProxyMethodBuilder.cs

@@ -141,6 +141,8 @@ public void CreateProxiedMethod(FieldInfo field, MethodInfo method, TypeBuilder
 			var proxyMethod = GenerateMethodSignature(method.Name, method, typeBuilder);
 
 			MethodBodyEmitter.EmitMethodBody(proxyMethod, callbackMethod, method, field);
+
+			typeBuilder.DefineMethodOverride(proxyMethod, method);
 		}
 	}
 }