[compiler-rt] [compiler-rt][hexagon] Fix `__hexagon_fmadf5` overflow under directed rounding (PR #207373)

[Brian Cain via llvm-commits]

androm3da wrote:

> https://github.com/llvm/llvm-project/actions/runs/28860463133/job/85770187077?pr=207373#step:6:15
> 
> Not sure what's going wrong here...

Github's been under some significant load lately and this is probably another symptom of that.

I'll retry it and see if it goes away.

https://github.com/llvm/llvm-project/pull/207373