[llvm] [DirectX] Cast the pointer for atomics whose value type differs (PR #226563)

[Justin Bogner via llvm-commits]

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

The change here looks good. I think the commit message is a bit overly verbose - we don't necessarily need to repeat all of the information in the github issue here - the link to that is persistent. I think a couple of sentences explaining what and why without necessarily describing the bug in detail would be sufficient.

https://github.com/llvm/llvm-project/pull/226563