[llvm] [APFloat] Add APFloat support for E8M0 type (PR #107127)

[Durgadoss R via llvm-commits]

durga4github wrote:

Sure, all for consistency! I was not aware of the jax side of things.
I will refresh and update the name to: "Float8E8M0FNU".

https://github.com/llvm/llvm-project/pull/107127