Remove the _Py_NO_SANITIZE_UNDEFINED macro

Author: encukou

Include/pyport.h

@@ -666,25 +666,6 @@ extern "C" {
 #endif
 
 
-// _Py_NO_SANITIZE_UNDEFINED(): Disable Undefined Behavior sanitizer (UBsan)
-// on a function.
-//
-// Clang and GCC 9.0+ use __attribute__((no_sanitize("undefined"))).
-// GCC 4.9+ uses __attribute__((no_sanitize_undefined)).
-#if defined(__has_feature)
-#  if __has_feature(undefined_behavior_sanitizer)
-#    define _Py_NO_SANITIZE_UNDEFINED __attribute__((no_sanitize("undefined")))
-#  endif
-#endif
-#if !defined(_Py_NO_SANITIZE_UNDEFINED) && defined(__GNUC__) \
-    && ((__GNUC__ >= 5) || (__GNUC__ == 4) && (__GNUC_MINOR__ >= 9))
-#  define _Py_NO_SANITIZE_UNDEFINED __attribute__((no_sanitize_undefined))
-#endif
-#ifndef _Py_NO_SANITIZE_UNDEFINED
-#  define _Py_NO_SANITIZE_UNDEFINED
-#endif
-
-
 // _Py_NONSTRING: The nonstring variable attribute specifies that an object or
 // member declaration with type array of char, signed char, or unsigned char,
 // or pointer to such a type is intended to store character arrays that do not