45bfb1cdf1
Improve accuracy of asinh and acosh This PR addresses the inaccuracy of `asinh` and `acosh` identified by the [Herbie](http://herbie.uwplse.org/) tool, `@pavpanchekha,` `@finnbear` in #104548. It also adds a couple tests that failed in the existing implementations and now pass. Closes #104548 r? rust-lang/libs