Use GCC/Clang builtins for overflows checking

[XVilka]

See librz/include/rz_types_overflow.h

See https://gcc.gnu.org/onlinedocs/gcc/Integer-Overflow-Builtins.html

An example how Meson checks for those could be added: bbc5457

[KBhushan07]

Hello @XVilka , want to work on it. can you assign it to me?

[XVilka]

@KBhushan07 done, go ahead

[KBhushan07]

Could you please review my approach for implementing GCC built-ins overflow checking in my code? I used "__builtin_add_overflow_p" for addition instead of "__builtin_add_overflow" due to the third argument requirement. For multiplication, I utilized a similar library for signed numbers, as I couldn't find one for unsigned numbers. I left subtraction unchanged since it uses addition checking internally. Lastly, I couldn't find a built-in function for division. Do you think this approach is appropriate, or do you have any suggestions for improvement?

Screenshot -

[XVilka]

1. I recommend using the subtraction nevertheless when available
2. You can not use builtins when they are not available, so it's ok to leave division checkers untouched
3. Using __builtin_add_overflow_p is fine