[clang] [llvm] [HexFloat] add HexFloat to APFloat (PR #179771)

[Nikita Popov via llvm-commits]

https://github.com/nikic requested changes to this pull request.

If I'm counting right, IEEEFloat is 3 words, while HexFloat is 5. This needs to be implemented in a way that does not increase APFloat size.

https://github.com/llvm/llvm-project/pull/179771