[llvm] [RFC][SPIR-V] Add llvm.arbitrary.fp.convert intrinsic (PR #164252)

[Dmitry Sidorov via llvm-commits]

MrSidims wrote:

Thanks, I going through the changes. I was waiting for approval to publish several SPIR-V extensions, and now with https://github.com/intel/llvm/pull/20467 public can go through with some concrete examples, including mini-float to mini-float conversions.

https://github.com/llvm/llvm-project/pull/164252