gh-122581: Use parser mutex in default build for subinterpreters (gh-142959)

Include/internal/pycore_parser.h

@@ -14,21 +14,6 @@ extern "C" {
 #include "pycore_pyarena.h"         // PyArena
 
 _Py_DECLARE_STR(empty, "")
-#if defined(Py_DEBUG) && defined(Py_GIL_DISABLED)
-#define _parser_runtime_state_INIT \
-    { \
-        .mutex = {0}, \
-        .dummy_name = { \
-            .kind = Name_kind, \
-            .v.Name.id = &_Py_STR(empty), \
-            .v.Name.ctx = Load, \
-            .lineno = 1, \
-            .col_offset = 0, \
-            .end_lineno = 1, \
-            .end_col_offset = 0, \
-        }, \
-    }
-#else
 #define _parser_runtime_state_INIT \
     { \
         .dummy_name = { \
@@ -41,7 +26,6 @@ _Py_DECLARE_STR(empty, "")
             .end_col_offset = 0, \
         }, \
     }
-#endif
 
 extern struct _mod* _PyParser_ASTFromString(
     const char *str,

Include/internal/pycore_runtime_structs.h

@@ -77,9 +77,7 @@ struct _fileutils_state {
 struct _parser_runtime_state {
 #ifdef Py_DEBUG
     long memo_statistics[_PYPEGEN_NSTATISTICS];
-#ifdef Py_GIL_DISABLED
     PyMutex mutex;
-#endif
 #else
     int _not_used;
 #endif