Pass more T_DATA to obj_free() under RUBY_FREE_AT_EXIT

T_DATA without a pointer or free function may still have ivars set on
them that need to be freed. The following leaked generic ivars for
example:

    converter = Encoding::Converter.allocate
    converter.instance_variable_set(:@foo, 1)

    STACK OF 1 INSTANCE OF 'ROOT LEAK: <malloc in objspace_xmalloc0>':
    <snip>
    12  miniruby    0x10286ec50 ivar_set + 140  variable.c:1850
    11  miniruby    0x102876afc generic_ivar_set + 136  variable.c:1668

1 files changed, 1 insertions, 1 deletions

diff --git a/gc.c b/gc.c
index 0e4dadbdd0..6245e2083b 100644
--- a/gc.c
+++ b/gc.c
@@ -4684,7 +4684,7 @@ rb_objspace_call_finalizer(rb_objspace_t *objspace)
             void *poisoned = asan_unpoison_object_temporary(vp);
             switch (BUILTIN_TYPE(vp)) {
               case T_DATA:
-                if (!DATA_PTR(p) || !RANY(p)->as.data.dfree) break;
+                if (!rb_free_at_exit && (!DATA_PTR(p) || !RANY(p)->as.data.dfree)) break;
                 if (rb_obj_is_thread(vp)) break;
                 if (rb_obj_is_mutex(vp)) break;
                 if (rb_obj_is_fiber(vp)) break;