[llvm] [APFloat] Fix sign bit corrupting exponent in unsigned FP8 formats (PR #223286)

[Cheng-Chieh Liu via llvm-commits]

jay87406 wrote:

@tgymnich Thanks for the reminder! I've updated my profile and verified that the email (jay87406 at gmail.com) is correctly associated with the commits.

https://github.com/llvm/llvm-project/pull/223286