return approximations for large float values in acosh and asinh

[malezjaa]

Fixes #153878
this fixes acosh and asinh for large float values using the approximation from libm

fn main() {
    let a = f16::MAX.asinh();
    let b = f16::MAX.acosh();
    println!("asinh: {a}, acosh: {b}");

    let a = f32::MAX.asinh();
    let b = f32::MAX.acosh();
    println!("asinh: {a}, acosh: {b}");

    let a = f64::MAX.asinh();
    let b = f64::MAX.acosh();
    println!("asinh: {a}, acosh: {b}");
}

asinh: 11.79, acosh: 11.79
asinh: 89.415985, acosh: 89.415985
asinh: 710.4758600739439, acosh: 710.4758600739439

[rustbot]

r? @joboet

rustbot has assigned @joboet.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

Why was this reviewer chosen?

The reviewer was selected based on:

• Owners of files modified in this PR: @ChrisDenton, libs
• @ChrisDenton, libs expanded to 8 candidates
• Random selection from Mark-Simulacrum, joboet

[reddevilmidzy]

Hello @malezjaa,
Next time you contribute, please check if someone has been assigned to the issue before contributing.

[malezjaa]

I'm really sorry about that. I should've checked If anyone was already assigned to this issue. I'll do that from now on.

[rustbot]

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.