GH-126910: avoid reading the FP for getting the SP

Author: diegorusso

Include/internal/pycore_pystate.h

@@ -306,23 +306,15 @@ _Py_AssertHoldsTstateFunc(const char *func)
 #define _Py_AssertHoldsTstate()
 #endif
 
-#if !_Py__has_builtin(__builtin_frame_address) && !defined(__GNUC__) && !defined(_MSC_VER)
 static uintptr_t return_pointer_as_int(char* p) {
     return (uintptr_t)p;
 }
-#endif
 
 static inline uintptr_t
 _Py_get_machine_stack_pointer(void) {
-#if _Py__has_builtin(__builtin_frame_address) || defined(__GNUC__)
-    return (uintptr_t)__builtin_frame_address(0);
-#elif defined(_MSC_VER)
-    return (uintptr_t)_AddressOfReturnAddress();
-#else
     char here;
     /* Avoid compiler warning about returning stack address */
     return return_pointer_as_int(&here);
-#endif
 }
 
 static inline intptr_t