[llvm] [Darwin] Fix availability of exp10 for watchOS, tvOS, xROS. (PR #98542)

[Florian Hahn via llvm-commits]

fhahn wrote:

> LGTM. Commit message suggestion while you're fixing formatting, I think it should say:
> 
> ```diff
> -On all platforms
> +On all other platforms
> ```

Thanks, should be fixed

https://github.com/llvm/llvm-project/pull/98542