Reduce manually duplicated code in random with deftransform for random
## Describe the bug
The `deftransform` for `random` (in
[float-tran.lisp](src/compiler/float-tran.lisp#L263)) has an
optimization for returning random integers less than $2^{32}$. However,
the function `random` (in
[rand-xoroshiro.lisp](src/code/rand-xoroshiro.lisp#L495) duplicates
this optimization.
This makes the code somewhat fragile if the `deftransform` is modified
but the function isn't (and vice versa). We can make this consistent
by just doing `(random arg state)` in `random`. Then we are always
consistent.
This, however, depends on the compiler being able to apply the
`deftransform`. Some simple testing shows that this is the case.
Reducing this duplication is useful.
Also note that [rand-mt19937.lisp](src/code/rand-mt19937.lisp#L450)
does exactly this.
## Desktop (please complete the following information):
- OS: All
issue