Add minimal repro of crash as a test

Author: mpage

Lib/test/test_peepholer.py

@@ -1,4 +1,5 @@
 import dis
+import gc
 from itertools import combinations, product
 import opcode
 import sys
@@ -2613,6 +2614,22 @@ def test_send(self):
         ]
         self.cfg_optimization_test(insts, expected, consts=[None])
 
+    def test_del_in_finally(self):
+        # This loads `obj` onto the stack, executes `del obj`, then returns the
+        # `obj` from the stack. See gh-133371 for more details.
+        def create_obj():
+            obj = [42]
+            try:
+                return obj
+            finally:
+                del obj
+
+        obj = create_obj()
+        # The crash in the linked issue happens while running GC during
+        # interpreter finalization, so run it here manually.
+        gc.collect()
+        self.assertEqual(obj, [42])
+
 
 
 if __name__ == "__main__":