[mlir] [mlir][VectorToLLVM] Add support for unrolling and lowering multi-dim… (PR #160405)

[Andrzej Warzyński]

banach-space wrote:

Thanks!

As pointed out by Kunwar, this is a duplicate of https://github.com/llvm/llvm-project/pull/132227, which contains a request for more testing.  I don't mind which PR lands, but lets make sure that there is more tests for this. 

IMO, `Vector` patterns should be tested more rigorously (as opposed to relying on `ConvertVectorToLLVM`).

https://github.com/llvm/llvm-project/pull/160405