[llvm] [DirectX][DXIL] Align type spec of TableGen DXIL Op and LLVM Intrinsic (PR #86311)

[S. Bharadwaj Yadavalli via llvm-commits]

bharadwajy wrote:

> I want to put the breaks on this PR.
> 
> We have a document that is documenting this design which is inconsistent with this PR. Before we merge this we should make the documentation consistent. The doc PR is here: #85170.

Updated the document 
1. to reflect the changes proposed in this PR. 
2. with details of another option - along with a link to corresponding changes.

Thanks!


https://github.com/llvm/llvm-project/pull/86311