Call obj_free for T_DATA, T_FILE objects on exit

Previously, T_DATA and T_FILE objects did not have their instance
variables freed on exit which would be reported as a memory leak with
RUBY_FREE_ON_EXIT. This commit changes it to use obj_free which also
frees the generic instance variables.

Co-authored-by: Alan Wu <XrXr@users.noreply.github.com>

gc.c

@@ -4565,6 +4565,12 @@ gc_abort(rb_objspace_t *objspace)
         }
     }
 
+    for (int i = 0; i < SIZE_POOL_COUNT; i++) {
+        rb_size_pool_t *size_pool = &size_pools[i];
+        rb_heap_t *heap = SIZE_POOL_EDEN_HEAP(size_pool);
+        rgengc_mark_and_rememberset_clear(objspace, heap);
+    }
+
     gc_mode_set(objspace, gc_mode_none);
 }
 
@@ -4602,7 +4608,7 @@ rb_objspace_free_objects(rb_objspace_t *objspace)
             switch (BUILTIN_TYPE(vp)) {
               case T_DATA: {
                 if (rb_obj_is_mutex(vp) || rb_obj_is_thread(vp)) {
-                    rb_data_free(objspace, vp);
+                    obj_free(objspace, vp);
                 }
                 break;
               }
@@ -4651,14 +4657,6 @@ rb_objspace_call_finalizer(rb_objspace_t *objspace)
     /* Abort incremental marking and lazy sweeping to speed up shutdown. */
     gc_abort(objspace);
 
-    if (rb_free_on_exit) {
-        for (int i = 0; i < SIZE_POOL_COUNT; i++) {
-            rb_size_pool_t *size_pool = &size_pools[i];
-            rb_heap_t *heap = SIZE_POOL_EDEN_HEAP(size_pool);
-            rgengc_mark_and_rememberset_clear(objspace, heap);
-        }
-    }
-
     /* prohibit GC because force T_DATA finalizers can break an object graph consistency */
     dont_gc_on();
 
@@ -4684,12 +4682,10 @@ rb_objspace_call_finalizer(rb_objspace_t *objspace)
                 if (rb_obj_is_fiber(vp)) break;
                 if (rb_obj_is_main_ractor(vp)) break;
 
-                rb_data_free(objspace, vp);
+                obj_free(objspace, vp);
                 break;
               case T_FILE:
-                if (RANY(p)->as.file.fptr) {
-                    make_io_zombie(objspace, vp);
-                }
+                obj_free(objspace, vp);
                 break;
               case T_SYMBOL:
               case T_ARRAY: