Factor out struct _ceval_interpreter_state.

Author: ericsnowcurrently

Include/internal/pycore_ceval.h

@@ -34,6 +34,13 @@ struct _pending_calls {
     int last;
 };
 
+struct _ceval_interpreter_state {
+    /* This single variable consolidates all requests to break out of
+       the fast path in the eval loop. */
+    _Py_atomic_int eval_breaker;
+    struct _pending_calls pending;
+};
+
 #include "pycore_gil.h"
 
 struct _ceval_runtime_state {

Include/internal/pycore_pystate.h

@@ -82,12 +82,7 @@ struct _is {
 
     uint64_t tstate_next_unique_id;
 
-    struct _ceval {
-        /* This single variable consolidates all requests to break out of
-           the fast path in the eval loop. */
-        _Py_atomic_int eval_breaker;
-        struct _pending_calls pending;
-    } ceval;
+    struct _ceval_interpreter_state ceval;
 };
 
 PyAPI_FUNC(struct _is*) _PyInterpreterState_LookUpID(PY_INT64_T);