patch 9.0.2038: Vim9: object method funcref not cleaned up after use

Problem:  Vim9: object method funcref not cleaned up after use
Solution: Clean up type stack after using object method funcref,
          remove now longer used ISN_DEFEROBJ instrunction

closes: #13360

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Yegappan Lakshmanan <yegappan@yahoo.com>
diff --git a/src/testdir/test_vim9_disassemble.vim b/src/testdir/test_vim9_disassemble.vim
index 6e27dbd..521f75f 100644
--- a/src/testdir/test_vim9_disassemble.vim
+++ b/src/testdir/test_vim9_disassemble.vim
@@ -3276,7 +3276,7 @@
     'defer a.Foo()\_s*' ..
     '0 LOAD arg\[-1\]\_s*' ..
     '1 FUNCREF A.Foo\_s*' ..
-    '2 DEFEROBJ 0 args\_s*' ..
+    '2 DEFER 0 args\_s*' ..
     '3 RETURN void', g:instr)
   unlet g:instr
 enddef