More precisely iterate over Object instance variables

Shapes provides us with an (almost) exact count of instance variables.
We only need to check for Qundef when an IV has been "undefined"
Prefer to use ROBJECT_IV_COUNT when iterating IVs

1 files changed, 2 insertions, 2 deletions

diff --git a/gc.c b/gc.c
index 52d5609c3e..7373bcfd67 100644
--- a/gc.c
+++ b/gc.c
@@ -7270,7 +7270,7 @@ gc_mark_children(rb_objspace_t *objspace, VALUE obj)
         {
             const VALUE * const ptr = ROBJECT_IVPTR(obj);
 
-            uint32_t i, len = ROBJECT_NUMIV(obj);
+            uint32_t i, len = ROBJECT_IV_COUNT(obj);
             for (i  = 0; i < len; i++) {
                 gc_mark(objspace, ptr[i]);
             }
@@ -10019,7 +10019,7 @@ gc_ref_update_object(rb_objspace_t *objspace, VALUE v)
     }
 #endif
 
-    for (uint32_t i = 0; i < numiv; i++) {
+    for (uint32_t i = 0; i < ROBJECT_IV_COUNT(v); i++) {
         UPDATE_IF_MOVED(objspace, ptr[i]);
     }
 }