https://git.ruby-lang.org/ruby.git/commit/?id=6778ba48fd

From 6778ba48fddcab1bca56b9bccc7ea5f9583baba8 Mon Sep 17 00:00:00 2001
From: Alan Wu <XrXr@u...>
Date: Fri, 6 Nov 2020 19:01:49 -0500
Subject: Fix excessive GC rooting

rb_vm_add_root_module() is enough to make sure the object become a GC
root.

diff --git a/class.c b/class.c
index 13885d9..4b8130d 100644
--- a/class.c
+++ b/class.c
@@ -834,7 +834,6 @@ rb_define_class_id_under(VALUE outer, ID id, VALUE super) https://github.com/ruby/ruby/blob/trunk/class.c#L834
     rb_const_set(outer, id, klass);
     rb_class_inherited(super, klass);
     rb_vm_add_root_module(klass);
-    rb_gc_register_mark_object(klass);
 
     return klass;
 }
@@ -872,7 +871,6 @@ rb_define_module(const char *name) https://github.com/ruby/ruby/blob/trunk/class.c#L871
     }
     module = rb_define_module_id(id);
     rb_vm_add_root_module(module);
-    rb_gc_register_mark_object(module);
     rb_const_set(rb_cObject, id, module);
 
     return module;
-- 
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