Issue #19512, #19515: remove shared identifiers, move identifiers where they

are used.

Move also _Py_IDENTIFIER() defintions to the top in modified files to remove
identifiers duplicated in the same file.

Modules/main.c

@@ -261,7 +261,7 @@ RunMainFromImporter(wchar_t *filename)
 
     /* argv0 is usable as an import source, so put it in sys.path[0]
        and import __main__ */
-    sys_path = _PySys_GetObjectId(&_PyId_path);
+    sys_path = PySys_GetObject("path");
     if (sys_path == NULL) {
         PyErr_SetString(PyExc_RuntimeError, "unable to get sys.path");
         goto error;