https://git.ruby-lang.org/ruby.git/commit/?id=2c19c1484a

From 2c19c1484abda749540c5865de4dce5a47fc8f0f Mon Sep 17 00:00:00 2001
From: Aaron Patterson <tenderlove@r...>
Date: Wed, 28 Oct 2020 09:42:34 -0700
Subject: If an object isn't embedded it will have an ivptr

We don't need to check the existence if an ivptr because non-embedded
objects will always have one

diff --git a/gc.c b/gc.c
index c97246a..d316feb 100644
--- a/gc.c
+++ b/gc.c
@@ -4077,9 +4077,8 @@ obj_memsize_of(VALUE obj, int use_all_types) https://github.com/ruby/ruby/blob/trunk/gc.c#L4077
 
     switch (BUILTIN_TYPE(obj)) {
       case T_OBJECT:
-	if (!(RBASIC(obj)->flags & ROBJECT_EMBED) &&
-	    ROBJECT(obj)->as.heap.ivptr) {
-	    size += ROBJECT(obj)->as.heap.numiv * sizeof(VALUE);
+	if (!(RBASIC(obj)->flags & ROBJECT_EMBED)) {
+	    size += ROBJECT_NUMIV(obj) * sizeof(VALUE);
 	}
 	break;
       case T_MODULE:
-- 
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