Add RVALUE_OVERHEAD and move ractor_belonging_id

This commit adds RVALUE_OVERHEAD for storing metadata at the end of the
slot. This commit moves the ractor_belonging_id in debug builds from the
flags to RVALUE_OVERHEAD which frees the 16 bits in the headers for
object shapes.

1 files changed, 2 insertions, 2 deletions

diff --git a/test/objspace/test_objspace.rb b/test/objspace/test_objspace.rb
index 2366ec3b61..1eded6a439 100644
--- a/test/objspace/test_objspace.rb
+++ b/test/objspace/test_objspace.rb
@@ -480,8 +480,8 @@ class TestObjSpace < Test::Unit::TestCase
         obj = JSON.parse(l)
         next if obj["type"] == "ROOT"
 
-        assert(obj["slot_size"] != nil)
-        assert(obj["slot_size"] % GC::INTERNAL_CONSTANTS[:BASE_SLOT_SIZE] == 0)
+        assert_not_nil obj["slot_size"]
+        assert_equal 0, obj["slot_size"] % GC::INTERNAL_CONSTANTS[:RVALUE_SIZE]
       }
     end
   end