[clang] [llvm] [mlir] [NVPTX] Add support for Distributed Shared Memory address space. (PR #135444)

[Artem Belevich via llvm-commits]

Artem-B wrote:

I wish PTX would be a bit more consistent about naming things. Documentation calls it distributed shared memory (and it is distributed, and is shared), but the PTX instructions, compiler builtins and intrinsics use shared::cluster (as opposed to regular shared AKA shared::cta).

I would prefer to keep nomenclature used in LLVM consistent everywhere and stick with SHARED_CLUSTER, given that it is already in use and happens to be technically more precise ("Distributed" can mean anything, while cluster is unambiguous in specifying the scope of sharing domain)

https://github.com/llvm/llvm-project/pull/135444