[llvm] [SPIRV] Enable `bfloat16` arithmetic (PR #166031)

[via llvm-commits]

YixingZhang007 wrote:

> > Overall LGTM! I left a small comment regarding the testing. Thank you!
> 
> Cheers - just to clarify, are you OK with this going in as is, or would you like to add some OpFmod testing - I've commented on the thread on that, but I'm not strongly opposed to adding it if you really want it.

I think everything looks good and 'OpFmod' can be added in a future patch. Thank you! 👍 

https://github.com/llvm/llvm-project/pull/166031