[clang] [llvm] [clang][NVPTX] Add support for scaled::n1::ue8m0 in FP8, FP6 and FP4 conversions (PR #227652)

[Erich Keane via llvm-commits]

https://github.com/erichkeane approved this pull request.

Clang is fine to me. 

https://github.com/llvm/llvm-project/pull/227652