[clang] [Clang][HIP][CUDA] Add `__cluster_dims__` and `__no_cluster__` attribute (PR #156686)

[Shilei Tian via cfe-commits]

shiltian wrote:

> I think the declspec spellings aren't done yet

I think that is also part of the "established nomenclature" that @Artem-B was referring to.

https://github.com/llvm/llvm-project/pull/156686