Update clang/lib/Headers/ptrauth.h

Co-authored-by: John McCall <[email protected]>

Author: AbhayKanhere

clang/lib/Headers/ptrauth.h

@@ -383,7 +383,8 @@ typedef __UINTPTR_TYPE__ ptrauth_generic_signature_t;
     (void)__old_data;                                                          \
     (void)__new_key;                                                           \
     (void)__new_data;                                                          \
-    __value + *(int *)((char *)__value + __addend);                            \
+    const char *__value_tmp = (const char*) (__value);                         \
+    (void*) (__value_tmp + *(const int *)(__value_tmp + (__addend)));          \
   })
 
 #define ptrauth_auth_function(__value, __old_key, __old_data)                  \