bpo-43244: Remove the pyarena.h header (GH-25007)

Remove the pyarena.h header file with functions:

* PyArena_New()
* PyArena_Free()
* PyArena_Malloc()
* PyArena_AddPyObject()

These functions were undocumented, excluded from the limited C API,
and were only used internally by the compiler.

Add pycore_pyarena.h header. Rename functions:

* PyArena_New() => _PyArena_New()
* PyArena_Free() => _PyArena_Free()
* PyArena_Malloc() => _PyArena_Malloc()
* PyArena_AddPyObject() => _PyArena_AddPyObject()

1 files changed, 4 insertions, 4 deletions

diff --git a/Tools/peg_generator/peg_extension/peg_extension.c b/Tools/peg_generator/peg_extension/peg_extension.c
index 209a34c..94e729e 100644
--- a/Tools/peg_generator/peg_extension/peg_extension.c
+++ b/Tools/peg_generator/peg_extension/peg_extension.c
@@ -32,7 +32,7 @@ parse_file(PyObject *self, PyObject *args, PyObject *kwds)
         return PyErr_Format(PyExc_ValueError, "Bad mode, must be 0 <= mode <= 2");
     }
 
-    PyArena *arena = PyArena_New();
+    PyArena *arena = _PyArena_New();
     if (arena == NULL) {
         return NULL;
     }
@@ -63,7 +63,7 @@ parse_file(PyObject *self, PyObject *args, PyObject *kwds)
 
 error:
     Py_XDECREF(filename_ob);
-    PyArena_Free(arena);
+    _PyArena_Free(arena);
     return result;
 }
 
@@ -80,7 +80,7 @@ parse_string(PyObject *self, PyObject *args, PyObject *kwds)
         return PyErr_Format(PyExc_ValueError, "Bad mode, must be 0 <= mode <= 2");
     }
 
-    PyArena *arena = PyArena_New();
+    PyArena *arena = _PyArena_New();
     if (arena == NULL) {
         return NULL;
     }
@@ -102,7 +102,7 @@ parse_string(PyObject *self, PyObject *args, PyObject *kwds)
 
 error:
     Py_XDECREF(filename_ob);
-    PyArena_Free(arena);
+    _PyArena_Free(arena);
     return result;
 }