[llvm] [NVPTX] Support !"cluster_dim_{x,y,z}" metadata (PR #109548)

[Artem Belevich via llvm-commits]

https://github.com/Artem-B commented:

LGTM in principle.

Would you be willing to land it as a separate commit? It's a nice self-contained improvement that's not directly related to the cluster_dim changes.

https://github.com/llvm/llvm-project/pull/109548