Start removing force_eval uses

[saethlin]

I'm starting here by deleting all the force_eval uses that are for raising floating-point exceptions.

@programmerjake is interested in some breadcrumbs for the non-default rounding modes uses, so I'm going to do something different for those.

[saethlin]

force_eval!(0.0 / 0.0) appears to not do anything at all:
https://play.rust-lang.org/?version=nightly&mode=release&edition=2021&gist=2621c439604f11b4ef53462f228f8c33

fn main() {
    unsafe {
        println!("{:032b}", _mm_getcsr());
        force_eval!(0.0 / 0.0);
        println!("{:032b}", _mm_getcsr());
    }
}

prints the same value twice.

[saethlin]

Oh neat, this bug was directly ported from musl.

[saethlin]

Since there's now effort port new implementations from musl, I'm more against changes like this that would cause implementation divergence.