cgen: implement > and < for structs

[Delta456]

This PR implements using > and < as operator overloading. If used then they must return type bool.

For example and usage see.

[Delta456]

I do not understand why it is failing as locally it is working.
Can anyone help?

/tmp/v/v.5599219661117039425.tmp.c:48001:6: error: implicit declaration of function ‘v__gen__x64__Register__lt’; did you mean ‘v__gen__x64__Register_str’? [-Werror=implicit-function-declaration]
  if (v__gen__x64__Register__lt(reg, v__gen__x64__Register_r8)) {

EDIT: Fixed