[llvm] [mlir] [MLIR][NVVM] Support stmatrix intrinsics (PR #148377)

[via llvm-commits]

Pecco-314 wrote:

> @Pecco-314 Can you please split the PR into two separate ones? One with NVPTX and one with MLIR changes. Both requires two different reviews and approvals from two different code owners

Done. The NVPTX part (#148561) has a dependency on the MLIR part, so I think the MLIR PR should to be reviewed first.

https://github.com/llvm/llvm-project/pull/148377