pythongh-110481: Fix biased reference counting queue initialization.

The biased reference counting queue must be initialized from the bound
(active) thread because it uses `_Py_ThreadId()` as the key in a hash
table.

Author: colesbury

Python/brc.c

@@ -119,6 +119,8 @@ _Py_brc_merge_refcounts(PyThreadState *tstate)
     struct _brc_thread_state *brc = &((_PyThreadStateImpl *)tstate)->brc;
     struct _brc_bucket *bucket = get_bucket(tstate->interp, brc->tid);
 
+    assert(brc->tid == _Py_ThreadId());
+
     // Append all objects into a local stack. We don't want to hold the lock
     // while calling destructors.
     PyMutex_Lock(&bucket->mutex);

Python/pystate.c

@@ -261,6 +261,12 @@ bind_tstate(PyThreadState *tstate)
     tstate->native_thread_id = PyThread_get_thread_native_id();
 #endif
 
+#ifdef Py_GIL_DISABLED
+    // Initialize biased reference counting inter-thread queue. Note that this
+    // needs to be initialized from the active thread.
+    _Py_brc_init_thread(tstate);
+#endif
+
     // mimalloc state needs to be initialized from the active thread.
     tstate_mimalloc_bind(tstate);
 
@@ -1412,10 +1418,6 @@ init_threadstate(_PyThreadStateImpl *_tstate,
     tstate->what_event = -1;
     tstate->previous_executor = NULL;
 
-#ifdef Py_GIL_DISABLED
-    // Initialize biased reference counting inter-thread queue
-    _Py_brc_init_thread(tstate);
-#endif
     llist_init(&_tstate->mem_free_queue);
 
     if (interp->stoptheworld.requested || _PyRuntime.stoptheworld.requested) {