Support call stack and FunctionExit for native functions.

src/tests.rs

@@ -37,9 +37,9 @@ fn check_struct_sizes() {
         assert_eq!(
             size_of::<NativeCallContext>(),
             if cfg!(feature = "no_position") {
-                64
-            } else {
                 72
+            } else {
+                80
             }
         );
     }