[3.14] gh-132775: Unrevert "Use _PyCode GetScriptXIData()" (gh-134736)

This reverts commit 7476f90af2, AKA gh-134600.

This effectively unreverts commit bbf8048c0f (gh-134515).

Lib/test/support/interpreters/channels.py

@@ -69,7 +69,7 @@ def list_all():
         if not hasattr(send, '_unboundop'):
             send._set_unbound(unboundop)
         else:
-            assert send._unbound[0] == op
+            assert send._unbound[0] == unboundop
         channels.append(chan)
     return channels