Consider adding bfloat16 support.

[mlawson-tt]

Arm v8.6 and RISC-V extensions Zfbfmin, Zvfbfmin, and Zvfbfwma add support for bfloat16 instructions. Modeling the bfloat16 type would be beneficial in emulating these extensions.

[nibrunie]

I think that is a great idea, I have just started nibrunie#1 and nibrunie/berkeley-testfloat-3#1 . The goal is to provide basic BF16 support and test case generation support for RISC-V Zfbfmin and Zvfbfmin. Feel free to contribute any feedback (once they are ready I would like to open PR against the official repos).

[nibrunieAtSi5]

I opened #21 to suggest something