GH-123545: Remove duplicate Py_DECREF when handling _PyOptimizer_Optimize errors (GH-123546)

Author: savannahostrowski

Misc/NEWS.d/next/Core_and_Builtins/2024-09-01-00-02-05.gh-issue-123545.8nQNbL.rst

@@ -0,0 +1 @@
+Fix a double decref in rare cases on experimental JIT builds.

Python/bytecodes.c

@@ -4739,8 +4739,6 @@ dummy_func(
                     if (optimized <= 0) {
                         exit->temperature = restart_backoff_counter(temperature);
                         if (optimized < 0) {
-                            Py_DECREF(current_executor);
-                            tstate->previous_executor = Py_None;
                             GOTO_UNWIND();
                         }
                         tstate->previous_executor = (PyObject *)current_executor;
@@ -4822,8 +4820,6 @@ dummy_func(
                 if (optimized <= 0) {
                     exit->temperature = restart_backoff_counter(exit->temperature);
                     if (optimized < 0) {
-                        Py_DECREF(current_executor);
-                        tstate->previous_executor = Py_None;
                         GOTO_UNWIND();
                     }
                     GOTO_TIER_ONE(target);