Stop invoking GC before `each_object` to avoid test failure;
MODIFY
src/gc.c
src/gc.c
@@ -1511,7 +1511,6 @@ mrb_objspace_each_objects(mrb_state *mrb, mrb_each_object_callback *callback, vo
{
mrb_bool iterating = mrb->gc.iterating;
- mrb_full_gc(mrb);
mrb->gc.iterating = TRUE;
if (iterating) {
gc_each_objects(mrb, &mrb->gc, callback, data);

Stop invoking GC before `each_object` to avoid test failure; #3616