gh-120593: Fix const qualifier in _PyLong_CompactValue() (#121053)

Remove the const qualifier of the argument of functions:

* _PyLong_IsCompact()
* _PyLong_CompactValue()

Py_TYPE() argument is not const.

Fix the compiler warning:

  Include/cpython/longintrepr.h: In function ‘_PyLong_CompactValue’:
  Include/pyport.h:19:31: error: cast discards ‘const’ qualifier from
  pointer target type [-Werror=cast-qual]
    (...)
  Include/cpython/longintrepr.h:133:30: note: in expansion of macro
  ‘Py_TYPE’
    assert(PyType_HasFeature(Py_TYPE(op), Py_TPFLAGS_LONG_SUBCLASS));

Author: vstinner

Include/cpython/longintrepr.h

@@ -119,15 +119,15 @@ PyAPI_FUNC(PyLongObject*) _PyLong_FromDigits(
 
 
 static inline int
-_PyLong_IsCompact(const PyLongObject* op) {
+_PyLong_IsCompact(PyLongObject* op) {
     assert(PyType_HasFeature(Py_TYPE(op), Py_TPFLAGS_LONG_SUBCLASS));
     return op->long_value.lv_tag < (2 << _PyLong_NON_SIZE_BITS);
 }
 
 #define PyUnstable_Long_IsCompact _PyLong_IsCompact
 
 static inline Py_ssize_t
-_PyLong_CompactValue(const PyLongObject *op)
+_PyLong_CompactValue(PyLongObject *op)
 {
     Py_ssize_t sign;
     assert(PyType_HasFeature(Py_TYPE(op), Py_TPFLAGS_LONG_SUBCLASS));

Include/internal/pycore_long.h

@@ -240,15 +240,15 @@ static inline int
 _PyLong_CompactSign(const PyLongObject *op)
 {
     assert(PyLong_Check(op));
-    assert(_PyLong_IsCompact(op));
+    assert(_PyLong_IsCompact((PyLongObject *)op));
     return 1 - (op->long_value.lv_tag & SIGN_MASK);
 }
 
 static inline int
 _PyLong_NonCompactSign(const PyLongObject *op)
 {
     assert(PyLong_Check(op));
-    assert(!_PyLong_IsCompact(op));
+    assert(!_PyLong_IsCompact((PyLongObject *)op));
     return 1 - (op->long_value.lv_tag & SIGN_MASK);
 }
 

Objects/longobject.c

@@ -6672,12 +6672,12 @@ _PyLong_FiniTypes(PyInterpreterState *interp)
 
 int
 PyUnstable_Long_IsCompact(const PyLongObject* op) {
-    return _PyLong_IsCompact(op);
+    return _PyLong_IsCompact((PyLongObject*)op);
 }
 
 #undef PyUnstable_Long_CompactValue
 
 Py_ssize_t
 PyUnstable_Long_CompactValue(const PyLongObject* op) {
-    return _PyLong_CompactValue(op);
+    return _PyLong_CompactValue((PyLongObject*)op);
 }