[clang] [HLSL] Appropriately set function attribute optnone (PR #125937)

[S. Bharadwaj Yadavalli via cfe-commits]

bharadwajy wrote:

Need to verify a couple more function attribute combinations. Changed it to draft mode till that is done. 

Please hold off reviews.

https://github.com/llvm/llvm-project/pull/125937